C# WinForms - 如何将更新从 DataGridView 发送到数据库

Question

我有一个包含客户表和代理表的 .mdb 文件。代理表迄今为止所做的唯一事情是填充每个客户的代理下拉列表...

我有一个链接到 customerBindingSource 的 DataGridView。 customerBindingSource 将 DataMember 设置为 Customer，将 DataSource 设置为 BindingSource1。这将数据源设置为 customerAppDS21。如果我选择 customerAppDS21 并在数据集设计器中单击“编辑”，我可以非常清楚地看到有一个“客户”表和“代理”表。这些是直接从 Data.mdf > 中拖动的。表文件夹。我已经完成配置向导并检查更新、插入和删除命令是否正确生成。

当用户离开一行或添加一行时，我正在设置唯一ID（GUID）（我认为两者都不需要，但我非常怀疑这是问题的原因）。用户可以更新或添加尽可能多的行。当用户单击“保存”按钮时，它会调用 customerTableAdapter.Update(customerAppDS21.Customer);。所有的事件都肯定是正确连接的。

问题基本上是数据集似乎已更新但数据库本身未更新。我可以关闭程序并立即重新加载它，数据就在那里。但是，如果我对代码进行任何更改，然后重新编译并加载程序，所有数据都会消失。这让我认为数据集正在更新，但数据库没有更新。

有谁知道如何解决这个问题？我尝试在 .Update(bla); 行之前和之后添加 .acceptChanges(); 行，但没有成功。我还尝试在 .Update(bla); 行之前调用 customerBindingSource.EndEdit(); 和 bindingSource1.EndEdit(); 。

任何对此的帮助将不胜感激。我已经遇到这个问题两天了，并尝试了一些教程来获得关于我哪里出错的提示。

问候，

理查德

更新：下面的代码...

void button1_Click(object sender, EventArgs e)
{
    Validate();
    customerBindingSource.EndEdit();
    customerTableAdapter.Update(customerAppDS21.Customer);
}

void grdCustomers_RowLeave(object sender, DataGridViewCellEventArgs e)
{
    DataGridViewRow gvr = grdCustomers.Rows[e.RowIndex];
    if (gvr.Cells[0].Value == null)
    {
        String g = Guid.NewGuid().ToString();
        gvr.Cells[0].Value = g;
    }
    else
    {
        String currID = gvr.Cells[0].Value.ToString();
        if (currID.Equals(""))
        {
            String g = Guid.NewGuid().ToString();
            gvr.Cells[0].Value = g;
        }
    }
}

void grdCustomers_UserAddedRow(object sender, DataGridViewRowEventArgs e)
{
    DataGridViewRow gvr = grdCustomers.Rows[grdCustomers.SelectedCells[0].RowIndex];
    if (gvr.Cells[0].Value == null)
    {
        String g = Guid.NewGuid().ToString();
        gvr.Cells[0].Value = g;
    }
    else
    {
        String currID = gvr.Cells[0].Value.ToString();
        if (currID.Equals(""))
        {
            String g = Guid.NewGuid().ToString();
            gvr.Cells[0].Value = g;
        }
    }
}

设计器代码（抱歉这么长 - 我不想冒错过任何重要内容的风险）：

namespace CustomerApp
{
    partial class CustomerAppForm
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle1 = new System.Windows.Forms.DataGridViewCellStyle();
            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle2 = new System.Windows.Forms.DataGridViewCellStyle();
            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle3 = new System.Windows.Forms.DataGridViewCellStyle();
            this.tabControl1 = new System.Windows.Forms.TabControl();
            this.tabPage1 = new System.Windows.Forms.TabPage();
            this.button1 = new System.Windows.Forms.Button();
            this.grdCustomers = new System.Windows.Forms.DataGridView();
            this.agentBindingSource = new System.Windows.Forms.BindingSource(this.components);
            this.bindingSource1 = new System.Windows.Forms.BindingSource(this.components);
            this.customerAppDS21 = new CustomerApp.CustomerAppDS2();
            this.tabPage2 = new System.Windows.Forms.TabPage();
            this.customerTableAdapter = new CustomerApp.CustomerAppDS2TableAdapters.CustomerTableAdapter();
            this.agentTableAdapter = new CustomerApp.CustomerAppDS2TableAdapters.AgentTableAdapter();
            this.customerBindingSource = new System.Windows.Forms.BindingSource(this.components);
            this.idDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.companynameDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.contactforenameDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.contactsurnameDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.companyaddress1DataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.companyaddress2DataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.companytownDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.companycountyDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.companypostcodeDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.contacttelephoneDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.contactfaxDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.contactemailDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.agentIDDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewComboBoxColumn();
            this.contactfullnameDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.tabControl1.SuspendLayout();
            this.tabPage1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.grdCustomers)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.agentBindingSource)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.customerAppDS21)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.customerBindingSource)).BeginInit();
            this.SuspendLayout();
            // 
            // tabControl1
            // 
            this.tabControl1.Controls.Add(this.tabPage1);
            this.tabControl1.Controls.Add(this.tabPage2);
            this.tabControl1.Location = new System.Drawing.Point(12, 12);
            this.tabControl1.Name = "tabControl1";
            this.tabControl1.SelectedIndex = 0;
            this.tabControl1.Size = new System.Drawing.Size(1000, 640);
            this.tabControl1.TabIndex = 0;
            // 
            // tabPage1
            // 
            this.tabPage1.Controls.Add(this.button1);
            this.tabPage1.Controls.Add(this.grdCustomers);
            this.tabPage1.Location = new System.Drawing.Point(4, 22);
            this.tabPage1.Name = "tabPage1";
            this.tabPage1.Padding = new System.Windows.Forms.Padding(3);
            this.tabPage1.Size = new System.Drawing.Size(992, 614);
            this.tabPage1.TabIndex = 0;
            this.tabPage1.Text = "Customers";
            this.tabPage1.UseVisualStyleBackColor = true;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(882, 462);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "Save";
            this.button1.UseVisualStyleBackColor = true;
            // 
            // grdCustomers
            // 
            this.grdCustomers.AllowUserToOrderColumns = true;
            this.grdCustomers.AutoGenerateColumns = false;
            dataGridViewCellStyle1.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
            dataGridViewCellStyle1.BackColor = System.Drawing.SystemColors.Control;
            dataGridViewCellStyle1.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            dataGridViewCellStyle1.ForeColor = System.Drawing.SystemColors.WindowText;
            dataGridViewCellStyle1.SelectionBackColor = System.Drawing.SystemColors.Highlight;
            dataGridViewCellStyle1.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
            dataGridViewCellStyle1.WrapMode = System.Windows.Forms.DataGridViewTriState.True;
            this.grdCustomers.ColumnHeadersDefaultCellStyle = dataGridViewCellStyle1;
            this.grdCustomers.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.grdCustomers.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
            this.idDataGridViewTextBoxColumn,
            this.companynameDataGridViewTextBoxColumn,
            this.contactforenameDataGridViewTextBoxColumn,
            this.contactsurnameDataGridViewTextBoxColumn,
            this.companyaddress1DataGridViewTextBoxColumn,
            this.companyaddress2DataGridViewTextBoxColumn,
            this.companytownDataGridViewTextBoxColumn,
            this.companycountyDataGridViewTextBoxColumn,
            this.companypostcodeDataGridViewTextBoxColumn,
            this.contacttelephoneDataGridViewTextBoxColumn,
            this.contactfaxDataGridViewTextBoxColumn,
            this.contactemailDataGridViewTextBoxColumn,
            this.agentIDDataGridViewTextBoxColumn,
            this.contactfullnameDataGridViewTextBoxColumn});
            this.grdCustomers.DataSource = this.customerBindingSource;
            dataGridViewCellStyle2.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
            dataGridViewCellStyle2.BackColor = System.Drawing.SystemColors.Window;
            dataGridViewCellStyle2.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            dataGridViewCellStyle2.ForeColor = System.Drawing.SystemColors.ControlText;
            dataGridViewCellStyle2.SelectionBackColor = System.Drawing.SystemColors.Highlight;
            dataGridViewCellStyle2.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
            dataGridViewCellStyle2.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
            this.grdCustomers.DefaultCellStyle = dataGridViewCellStyle2;
            this.grdCustomers.Location = new System.Drawing.Point(3, 3);
            this.grdCustomers.Name = "grdCustomers";
            dataGridViewCellStyle3.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
            dataGridViewCellStyle3.BackColor = System.Drawing.SystemColors.Control;
            dataGridViewCellStyle3.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            dataGridViewCellStyle3.ForeColor = System.Drawing.SystemColors.WindowText;
            dataGridViewCellStyle3.SelectionBackColor = System.Drawing.SystemColors.Highlight;
            dataGridViewCellStyle3.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
            dataGridViewCellStyle3.WrapMode = System.Windows.Forms.DataGridViewTriState.True;
            this.grdCustomers.RowHeadersDefaultCellStyle = dataGridViewCellStyle3;
            this.grdCustomers.RowTemplate.DefaultCellStyle.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(255)))), ((int)(((byte)(192)))));
            this.grdCustomers.RowTemplate.DefaultCellStyle.Padding = new System.Windows.Forms.Padding(2);
            this.grdCustomers.RowTemplate.DefaultCellStyle.SelectionBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(224)))), ((int)(((byte)(192)))));
            this.grdCustomers.Size = new System.Drawing.Size(983, 605);
            this.grdCustomers.TabIndex = 0;
            // 
            // agentBindingSource
            // 
            this.agentBindingSource.DataMember = "Agent";
            this.agentBindingSource.DataSource = this.bindingSource1;
            // 
            // bindingSource1
            // 
            this.bindingSource1.AllowNew = true;
            this.bindingSource1.DataSource = this.customerAppDS21;
            this.bindingSource1.Position = 0;
            // 
            // customerAppDS21
            // 
            this.customerAppDS21.DataSetName = "CustomerAppDS2";
            this.customerAppDS21.SchemaSerializationMode = System.Data.SchemaSerializationMode.IncludeSchema;
            // 
            // tabPage2
            // 
            this.tabPage2.Location = new System.Drawing.Point(4, 22);
            this.tabPage2.Name = "tabPage2";
            this.tabPage2.Padding = new System.Windows.Forms.Padding(3);
            this.tabPage2.Size = new System.Drawing.Size(992, 614);
            this.tabPage2.TabIndex = 1;
            this.tabPage2.Text = "Agents";
            this.tabPage2.UseVisualStyleBackColor = true;
            // 
            // customerTableAdapter
            // 
            this.customerTableAdapter.ClearBeforeFill = true;
            // 
            // agentTableAdapter
            // 
            this.agentTableAdapter.ClearBeforeFill = true;
            // 
            // customerBindingSource
            // 
            this.customerBindingSource.DataMember = "Customer";
            this.customerBindingSource.DataSource = this.bindingSource1;
            // 
            // idDataGridViewTextBoxColumn
            // 
            this.idDataGridViewTextBoxColumn.DataPropertyName = "id";
            this.idDataGridViewTextBoxColumn.HeaderText = "id";
            this.idDataGridViewTextBoxColumn.Name = "idDataGridViewTextBoxColumn";
            this.idDataGridViewTextBoxColumn.ReadOnly = true;
            // 
            // companynameDataGridViewTextBoxColumn
            // 
            this.companynameDataGridViewTextBoxColumn.DataPropertyName = "company_name";
            this.companynameDataGridViewTextBoxColumn.HeaderText = "Company Name";
            this.companynameDataGridViewTextBoxColumn.Name = "companynameDataGridViewTextBoxColumn";
            this.companynameDataGridViewTextBoxColumn.ToolTipText = "The name of the company";
            // 
            // contactforenameDataGridViewTextBoxColumn
            // 
            this.contactforenameDataGridViewTextBoxColumn.DataPropertyName = "contact_forename";
            this.contactforenameDataGridViewTextBoxColumn.HeaderText = "Contact Forename";
            this.contactforenameDataGridViewTextBoxColumn.Name = "contactforenameDataGridViewTextBoxColumn";
            // 
            // contactsurnameDataGridViewTextBoxColumn
            // 
            this.contactsurnameDataGridViewTextBoxColumn.DataPropertyName = "contact_surname";
            this.contactsurnameDataGridViewTextBoxColumn.HeaderText = "Contact Surname";
            this.contactsurnameDataGridViewTextBoxColumn.Name = "contactsurnameDataGridViewTextBoxColumn";
            // 
            // companyaddress1DataGridViewTextBoxColumn
            // 
            this.companyaddress1DataGridViewTextBoxColumn.DataPropertyName = "company_address1";
            this.companyaddress1DataGridViewTextBoxColumn.HeaderText = "Address 1";
            this.companyaddress1DataGridViewTextBoxColumn.Name = "companyaddress1DataGridViewTextBoxColumn";
            // 
            // companyaddress2DataGridViewTextBoxColumn
            // 
            this.companyaddress2DataGridViewTextBoxColumn.DataPropertyName = "company_address2";
            this.companyaddress2DataGridViewTextBoxColumn.HeaderText = "Address 2";
            this.companyaddress2DataGridViewTextBoxColumn.Name = "companyaddress2DataGridViewTextBoxColumn";
            // 
            // companytownDataGridViewTextBoxColumn
            // 
            this.companytownDataGridViewTextBoxColumn.DataPropertyName = "company_town";
            this.companytownDataGridViewTextBoxColumn.HeaderText = "Town";
            this.companytownDataGridViewTextBoxColumn.Name = "companytownDataGridViewTextBoxColumn";
            // 
            // companycountyDataGridViewTextBoxColumn
            // 
            this.companycountyDataGridViewTextBoxColumn.DataPropertyName = "company_county";
            this.companycountyDataGridViewTextBoxColumn.HeaderText = "County";
            this.companycountyDataGridViewTextBoxColumn.Name = "companycountyDataGridViewTextBoxColumn";
            // 
            // companypostcodeDataGridViewTextBoxColumn
            // 
            this.companypostcodeDataGridViewTextBoxColumn.DataPropertyName = "company_postcode";
            this.companypostcodeDataGridViewTextBoxColumn.HeaderText = "Postcode";
            this.companypostcodeDataGridViewTextBoxColumn.Name = "companypostcodeDataGridViewTextBoxColumn";
            // 
            // contacttelephoneDataGridViewTextBoxColumn
            // 
            this.contacttelephoneDataGridViewTextBoxColumn.DataPropertyName = "contact_telephone";
            this.contacttelephoneDataGridViewTextBoxColumn.HeaderText = "Telephone";
            this.contacttelephoneDataGridViewTextBoxColumn.Name = "contacttelephoneDataGridViewTextBoxColumn";
            // 
            // contactfaxDataGridViewTextBoxColumn
            // 
            this.contactfaxDataGridViewTextBoxColumn.DataPropertyName = "contact_fax";
            this.contactfaxDataGridViewTextBoxColumn.HeaderText = "Fax";
            this.contactfaxDataGridViewTextBoxColumn.Name = "contactfaxDataGridViewTextBoxColumn";
            // 
            // contactemailDataGridViewTextBoxColumn
            // 
            this.contactemailDataGridViewTextBoxColumn.DataPropertyName = "contact_email";
            this.contactemailDataGridViewTextBoxColumn.HeaderText = "Email";
            this.contactemailDataGridViewTextBoxColumn.Name = "contactemailDataGridViewTextBoxColumn";
            // 
            // agentIDDataGridViewTextBoxColumn
            // 
            this.agentIDDataGridViewTextBoxColumn.DataPropertyName = "agentID";
            this.agentIDDataGridViewTextBoxColumn.DataSource = this.agentBindingSource;
            this.agentIDDataGridViewTextBoxColumn.DisplayMember = "contact_fullname";
            this.agentIDDataGridViewTextBoxColumn.HeaderText = "agentID";
            this.agentIDDataGridViewTextBoxColumn.Name = "agentIDDataGridViewTextBoxColumn";
            this.agentIDDataGridViewTextBoxColumn.Resizable = System.Windows.Forms.DataGridViewTriState.True;
            this.agentIDDataGridViewTextBoxColumn.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.Automatic;
            this.agentIDDataGridViewTextBoxColumn.ValueMember = "id";
            // 
            // contactfullnameDataGridViewTextBoxColumn
            // 
            this.contactfullnameDataGridViewTextBoxColumn.DataPropertyName = "contact_fullname";
            this.contactfullnameDataGridViewTextBoxColumn.HeaderText = "contact_fullname";
            this.contactfullnameDataGridViewTextBoxColumn.Name = "contactfullnameDataGridViewTextBoxColumn";
            this.contactfullnameDataGridViewTextBoxColumn.ReadOnly = true;
            this.contactfullnameDataGridViewTextBoxColumn.Visible = false;
            // 
            // CustomerAppForm
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(1184, 662);
            this.Controls.Add(this.tabControl1);
            this.Location = new System.Drawing.Point(100, 100);
            this.Name = "CustomerAppForm";
            this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
            this.Text = "Heritage Art Papers Ltd - Customer Application";
            this.Load += new System.EventHandler(this.CustomerAppForm_Load);
            this.tabControl1.ResumeLayout(false);
            this.tabPage1.ResumeLayout(false);
            ((System.ComponentModel.ISupportInitialize)(this.grdCustomers)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.agentBindingSource)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.customerAppDS21)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.customerBindingSource)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.TabControl tabControl1;
        private System.Windows.Forms.TabPage tabPage1;
        private System.Windows.Forms.TabPage tabPage2;
        private System.Windows.Forms.BindingSource bindingSource1;
        private CustomerAppDS2 customerAppDS21;
        private System.Windows.Forms.BindingSource agentBindingSource;
        private CustomerAppDS2TableAdapters.CustomerTableAdapter customerTableAdapter;
        private CustomerAppDS2TableAdapters.AgentTableAdapter agentTableAdapter;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.BindingSource customerBindingSource;
        private System.Windows.Forms.DataGridViewTextBoxColumn idDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn companynameDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn contactforenameDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn contactsurnameDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn companyaddress1DataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn companyaddress2DataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn companytownDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn companycountyDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn companypostcodeDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn contacttelephoneDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn contactfaxDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn contactemailDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewComboBoxColumn agentIDDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridViewTextBoxColumn contactfullnameDataGridViewTextBoxColumn;
        private System.Windows.Forms.DataGridView grdCustomers;

    }
}