主/详细数据网格视图与 C# 中字符串类型的关系

发布于 2024-07-13 21:24:33 字数 4553 浏览 2 评论 0原文

我想在 C# 中使用两个 datagridview 和 DataRelation 来显示主/详细关系。

主表和从表之间的关系是字符串类型的ID(并且没有机会将ID更改为整数类型)。

更改主表中的行时,DataGridView 似乎无法更新详细信息视图。

有谁知道是否可以使用字符串 ID 实现主/详细视图,如果可以,如何实现? 或者我是否必须使用其他公司的外部 DataGrid?


更新

就我个人而言,我认为使用字符串而不是整数没有什么区别。 我唯一能想到的是网格无法使用字符串 ID 关系处理主详细信息视图。

这是一个例子,请新建一个VS 2008项目并复制代码。 更改连接字符串和数据关系:

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
    private DataGridView masterDataGridView = new DataGridView();
    private BindingSource masterBindingSource = new BindingSource();
    private DataGridView detailsDataGridView = new DataGridView();
    private BindingSource detailsBindingSource = new BindingSource();

    [STAThreadAttribute()]
    public static void Main()
    {
        Application.Run(new Form1());
    }

    // Initializes the form.
    public Form1()
    {
        masterDataGridView.Dock = DockStyle.Fill;
        detailsDataGridView.Dock = DockStyle.Fill;

        SplitContainer splitContainer1 = new SplitContainer();
        splitContainer1.Dock = DockStyle.Fill;
        splitContainer1.Orientation = Orientation.Horizontal;
        splitContainer1.Panel1.Controls.Add(masterDataGridView);
        splitContainer1.Panel2.Controls.Add(detailsDataGridView);

        this.Controls.Add(splitContainer1);
        this.Load += new System.EventHandler(Form1_Load);
        this.Text = "DataGridView master/detail demo";
    }

    private void Form1_Load(object sender, System.EventArgs e)
    {
        // Bind the DataGridView controls to the BindingSource
        // components and load the data from the database.
        masterDataGridView.DataSource = masterBindingSource;
        detailsDataGridView.DataSource = detailsBindingSource;
        GetData();

        // Resize the master DataGridView columns to fit the newly loaded data.
        masterDataGridView.AutoResizeColumns();

        // Configure the details DataGridView so that its columns automatically
        // adjust their widths when the data changes.
        detailsDataGridView.AutoSizeColumnsMode =
            DataGridViewAutoSizeColumnsMode.AllCells;
    }

    private void GetData()
    {
        try
        {
            // Specify a connection string. Replace the given value with a 
            // valid connection string for a Northwind SQL Server sample
            // database accessible to your system.
            String connectionString =
                "";
            SqlConnection connection = new SqlConnection(connectionString);

            WindowsFormsApplication1.ConcordanceServer.IConcordanceServerToGUI cs = new WindowsFormsApplication1.ConcordanceServer.ConcordanceServerToGUIClient();

            // Create a DataSet.
            DataSet data = new DataSet();
            data.Locale = System.Globalization.CultureInfo.InvariantCulture;


            // Add data from the Customers table to the DataSet.
            SqlDataAdapter masterDataAdapter = new
                SqlDataAdapter("select * from customers", connection);
            masterDataAdapter.Fill(data, "Customers");

            // Add data from the Orders table to the DataSet.
            SqlDataAdapter detailsDataAdapter = new
                SqlDataAdapter("select * from Orders", connection);
            detailsDataAdapter.Fill(data, "Orders");

            // Establish a relationship between the two tables.
            DataRelation relation = new DataRelation("CustomersOrders",
                data.Tables["Customers"].Columns["strID"],
                data.Tables["Orders"].Columns["strID"]);
            data.Relations.Add(relation);

            // Bind the master data connector to the Customers table.
            masterBindingSource.DataSource = data;
            masterBindingSource.DataMember = "Customers";

            // Bind the details data connector to the master data connector,
            // using the DataRelation name to filter the information in the 
            // details table based on the current row in the master table. 
            detailsBindingSource.DataSource = masterBindingSource;
            detailsBindingSource.DataMember = "CustomersOrders";




        }
        catch (SqlException)
        {
            MessageBox.Show("To run this example, replace the value of the " +
                "connectionString variable with a connection string that is " +
                "valid for your system.");
        }
    }
}

I want to show a master / detail relationship using two datagridviews and DataRelation in C#.

The relation between the master and the detail table is an ID from type string (and there is no chance to change the ID to type integer).

It seems like the DataGridView is not able to update the detail view when changing the row in the master table.

Does anybody know if it is possible to achieve a master / detail view using a string ID and if yes, how? Or do I have to use an external DataGrid from another company?


UPDATE

Personally I don't see a difference in using a string instead of an integer. The only thing I can think of is that the grid cannot handle a master detail view using a string ID relation.

Here is an example, please create a new VS 2008 project and copy the code. Change the connection string and the datarelation:

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
    private DataGridView masterDataGridView = new DataGridView();
    private BindingSource masterBindingSource = new BindingSource();
    private DataGridView detailsDataGridView = new DataGridView();
    private BindingSource detailsBindingSource = new BindingSource();

    [STAThreadAttribute()]
    public static void Main()
    {
        Application.Run(new Form1());
    }

    // Initializes the form.
    public Form1()
    {
        masterDataGridView.Dock = DockStyle.Fill;
        detailsDataGridView.Dock = DockStyle.Fill;

        SplitContainer splitContainer1 = new SplitContainer();
        splitContainer1.Dock = DockStyle.Fill;
        splitContainer1.Orientation = Orientation.Horizontal;
        splitContainer1.Panel1.Controls.Add(masterDataGridView);
        splitContainer1.Panel2.Controls.Add(detailsDataGridView);

        this.Controls.Add(splitContainer1);
        this.Load += new System.EventHandler(Form1_Load);
        this.Text = "DataGridView master/detail demo";
    }

    private void Form1_Load(object sender, System.EventArgs e)
    {
        // Bind the DataGridView controls to the BindingSource
        // components and load the data from the database.
        masterDataGridView.DataSource = masterBindingSource;
        detailsDataGridView.DataSource = detailsBindingSource;
        GetData();

        // Resize the master DataGridView columns to fit the newly loaded data.
        masterDataGridView.AutoResizeColumns();

        // Configure the details DataGridView so that its columns automatically
        // adjust their widths when the data changes.
        detailsDataGridView.AutoSizeColumnsMode =
            DataGridViewAutoSizeColumnsMode.AllCells;
    }

    private void GetData()
    {
        try
        {
            // Specify a connection string. Replace the given value with a 
            // valid connection string for a Northwind SQL Server sample
            // database accessible to your system.
            String connectionString =
                "";
            SqlConnection connection = new SqlConnection(connectionString);

            WindowsFormsApplication1.ConcordanceServer.IConcordanceServerToGUI cs = new WindowsFormsApplication1.ConcordanceServer.ConcordanceServerToGUIClient();

            // Create a DataSet.
            DataSet data = new DataSet();
            data.Locale = System.Globalization.CultureInfo.InvariantCulture;


            // Add data from the Customers table to the DataSet.
            SqlDataAdapter masterDataAdapter = new
                SqlDataAdapter("select * from customers", connection);
            masterDataAdapter.Fill(data, "Customers");

            // Add data from the Orders table to the DataSet.
            SqlDataAdapter detailsDataAdapter = new
                SqlDataAdapter("select * from Orders", connection);
            detailsDataAdapter.Fill(data, "Orders");

            // Establish a relationship between the two tables.
            DataRelation relation = new DataRelation("CustomersOrders",
                data.Tables["Customers"].Columns["strID"],
                data.Tables["Orders"].Columns["strID"]);
            data.Relations.Add(relation);

            // Bind the master data connector to the Customers table.
            masterBindingSource.DataSource = data;
            masterBindingSource.DataMember = "Customers";

            // Bind the details data connector to the master data connector,
            // using the DataRelation name to filter the information in the 
            // details table based on the current row in the master table. 
            detailsBindingSource.DataSource = masterBindingSource;
            detailsBindingSource.DataMember = "CustomersOrders";




        }
        catch (SqlException)
        {
            MessageBox.Show("To run this example, replace the value of the " +
                "connectionString variable with a connection string that is " +
                "valid for your system.");
        }
    }
}

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