InvalidOperationException - 结束编辑单元格时 移动到另一个单元格
我制作了一个程序,我想在其中手动更新数据网格视图。 -我有一种通过清除 DGV 然后重新插入数据来刷新 DGV 的方法。 -使用设计器,我为 DGV 的 CellEndEdit 制作了一个事件处理程序。 在事件处理程序内部,数据被更新并更新。 调用 DGV 的自定义刷新方法。
运行程序时,每当我开始编辑单元格时, 通过选择另一个来结束它,抛出异常:
InvalidOperationException 操作无效,因为它会导致对 SetCurrentCellAddressCore 函数的重入调用。
Visual C# 的调试器标记清除数据的行:datagridview1.Rows.Clear();
如果您想重现该问题,请使用 Visual C# 创建一个新的 Windows 窗体项目,在窗体上放置一个 DataGridView 对象,然后为 Form1.cs 粘贴以下代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Error___DataGridView_Updating___Cell_endedit
{
public partial class Form1 : Form
{
// Objects
DataTable dt;
DataColumn colID;
DataColumn colName;
DataColumn colInfo;
// Constructor
public Form1()
{
InitializeComponent();
Initialize_dt();
InsertSampleData_dt();
Initialize_dataGridView1();
}
// Methods
private void Initialize_dt()
{
dt = new DataTable();
// Building Columns
// ID
colID = new DataColumn();
colID.ColumnName = "ID";
colID.DataType = typeof(int);
dt.Columns.Add(colID);
// Name
colName = new DataColumn();
colName.ColumnName = "Name";
colName.DataType = typeof(string);
dt.Columns.Add(colName);
//Info
colInfo = new DataColumn();
colInfo.ColumnName = "Info";
colInfo.DataType = typeof(string);
dt.Columns.Add(colInfo);
}
private void InsertSampleData_dt()
{
DataRow row;
// 0
row = dt.NewRow();
row["ID"] = 100;
row["Name"] = "AAAA";
row["Info"] = "First Record";
dt.Rows.Add(row);
//1
row = dt.NewRow();
row["ID"] = 101;
row["Name"] = "BBBB";
row["Info"] = "Second Record";
dt.Rows.Add(row);
//2
row = dt.NewRow();
row["ID"] = 102;
row["Name"] = "CCCC";
row["Info"] = "Third Record";
dt.Rows.Add(row);
}
private void Initialize_dataGridView1()
{
dataGridView1.AllowUserToAddRows = false;
// Data Grid Definitions
// Row Header
dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;
dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders;
// ColumnHeaders
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
// Building Columns
#region ID
{
DataGridViewColumn colSGID = new DataGridViewTextBoxColumn();
colSGID.Name = "ID";
colSGID.HeaderText = "#";
colSGID.ReadOnly = true;
colSGID.Visible = false;
colSGID.Resizable = DataGridViewTriState.False;
dataGridView1.Columns.Add(colSGID);
}
#endregion
#region Name
{
DataGridViewColumn colSGName = new DataGridViewTextBoxColumn();
colSGName.Name = "Name";
colSGName.HeaderText = "Name";
dataGridView1.Columns.Add(colSGName);
}
#endregion
#region Info
{
DataGridViewColumn colSGSubject = new DataGridViewTextBoxColumn();
colSGSubject.Name = "Info";
colSGSubject.HeaderText = "Description";
dataGridView1.Columns.Add(colSGSubject);
}
#endregion
Refresh_dataGridView1();
}
private void Refresh_dataGridView1()
{
int index;
dataGridView1.SuspendLayout();
dataGridView1.Rows.Clear();
//MessageBox.Show("Cleared Data. Rebuilding...");
foreach (DataRow row in dt.Rows)
{
index = dataGridView1.Rows.Add(new DataGridViewRow());
dataGridView1.Rows[index].Cells["ID"].Value = row["ID"];
dataGridView1.Rows[index].Cells["Name"].Value = row["Name"];
dataGridView1.Rows[index].Cells["Info"].Value = row["Info"];
//MessageBox.Show("row #" + index);
}
dataGridView1.ResumeLayout();
}
//Event Handlers
private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
bool toUpdate = false;
int id = (int)dataGridView1.Rows[e.RowIndex].Cells["ID"].Value;
string columnName = dataGridView1.Columns[e.ColumnIndex].Name;
string value = (string)dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
if (value == null)
{
value = string.Empty;
}
switch (columnName)
{
case "Name":
if (value == string.Empty)
{
MessageBox.Show("Name Can't Be Empty!");
}
else
{
toUpdate = true;
}
break;
case "Info":
toUpdate = true;
break;
}
if (toUpdate)
{
foreach(DataRow row in dt.Rows)
{
if ( (int)row["ID"] == id)
{
row[columnName] = value;
}
}
Refresh_dataGridView1();
}
}
}
}
I made a program in which I wanted to manually update the Data Grid View.
-I have a Method to Refresh the DGV by clearing it and then reinserting the data.
-Using the designer, I made an event handler for the DGV's CellEndEdit. Inside the Event Handler, the data gets updated & the DGV's custom refreshing method is called.
While running the program, whenever I start editing a cell & end it by selecting another one, an exception is thrown:
InvalidOperationException
Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore function.
Visual C#'s debugger marks the line that clears the data : datagridview1.Rows.Clear();
If you'd like to reproduce the problem, Make a new windows form project with visual c#, put a DataGridView object on the form, and paste the following code for the Form1.cs:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Error___DataGridView_Updating___Cell_endedit
{
public partial class Form1 : Form
{
// Objects
DataTable dt;
DataColumn colID;
DataColumn colName;
DataColumn colInfo;
// Constructor
public Form1()
{
InitializeComponent();
Initialize_dt();
InsertSampleData_dt();
Initialize_dataGridView1();
}
// Methods
private void Initialize_dt()
{
dt = new DataTable();
// Building Columns
// ID
colID = new DataColumn();
colID.ColumnName = "ID";
colID.DataType = typeof(int);
dt.Columns.Add(colID);
// Name
colName = new DataColumn();
colName.ColumnName = "Name";
colName.DataType = typeof(string);
dt.Columns.Add(colName);
//Info
colInfo = new DataColumn();
colInfo.ColumnName = "Info";
colInfo.DataType = typeof(string);
dt.Columns.Add(colInfo);
}
private void InsertSampleData_dt()
{
DataRow row;
// 0
row = dt.NewRow();
row["ID"] = 100;
row["Name"] = "AAAA";
row["Info"] = "First Record";
dt.Rows.Add(row);
//1
row = dt.NewRow();
row["ID"] = 101;
row["Name"] = "BBBB";
row["Info"] = "Second Record";
dt.Rows.Add(row);
//2
row = dt.NewRow();
row["ID"] = 102;
row["Name"] = "CCCC";
row["Info"] = "Third Record";
dt.Rows.Add(row);
}
private void Initialize_dataGridView1()
{
dataGridView1.AllowUserToAddRows = false;
// Data Grid Definitions
// Row Header
dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;
dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders;
// ColumnHeaders
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
// Building Columns
#region ID
{
DataGridViewColumn colSGID = new DataGridViewTextBoxColumn();
colSGID.Name = "ID";
colSGID.HeaderText = "#";
colSGID.ReadOnly = true;
colSGID.Visible = false;
colSGID.Resizable = DataGridViewTriState.False;
dataGridView1.Columns.Add(colSGID);
}
#endregion
#region Name
{
DataGridViewColumn colSGName = new DataGridViewTextBoxColumn();
colSGName.Name = "Name";
colSGName.HeaderText = "Name";
dataGridView1.Columns.Add(colSGName);
}
#endregion
#region Info
{
DataGridViewColumn colSGSubject = new DataGridViewTextBoxColumn();
colSGSubject.Name = "Info";
colSGSubject.HeaderText = "Description";
dataGridView1.Columns.Add(colSGSubject);
}
#endregion
Refresh_dataGridView1();
}
private void Refresh_dataGridView1()
{
int index;
dataGridView1.SuspendLayout();
dataGridView1.Rows.Clear();
//MessageBox.Show("Cleared Data. Rebuilding...");
foreach (DataRow row in dt.Rows)
{
index = dataGridView1.Rows.Add(new DataGridViewRow());
dataGridView1.Rows[index].Cells["ID"].Value = row["ID"];
dataGridView1.Rows[index].Cells["Name"].Value = row["Name"];
dataGridView1.Rows[index].Cells["Info"].Value = row["Info"];
//MessageBox.Show("row #" + index);
}
dataGridView1.ResumeLayout();
}
//Event Handlers
private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
bool toUpdate = false;
int id = (int)dataGridView1.Rows[e.RowIndex].Cells["ID"].Value;
string columnName = dataGridView1.Columns[e.ColumnIndex].Name;
string value = (string)dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
if (value == null)
{
value = string.Empty;
}
switch (columnName)
{
case "Name":
if (value == string.Empty)
{
MessageBox.Show("Name Can't Be Empty!");
}
else
{
toUpdate = true;
}
break;
case "Info":
toUpdate = true;
break;
}
if (toUpdate)
{
foreach(DataRow row in dt.Rows)
{
if ( (int)row["ID"] == id)
{
row[columnName] = value;
}
}
Refresh_dataGridView1();
}
}
}
}
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Bruce.Zhou 在 MSDN 论坛上有一个答案。 我在这里发布了其中的一个片段。 这里也是链接到原来的帖子。
使用此修复时,每当选择新单元格时,都会选择它与第一个单元格(包括)之间的所有单元格。 我正在寻找一种仅选择新单元格的方法。
There's an answer by Bruce.Zhou at MSDN forums. I posted here a snippet from it. Here also is the link to the original post.
When using this fix, whenever the new cell is selected, all the cells between it and the first cell (including) are selected. I am looking for a way to select only the new cell.
我在最后一个小时里用头撞键盘来解决这个问题。
这是我的解决方法:
查看问题:当选择另一个单元格(或 gridview 中的任何控件)时,会触发 EndEdit。
在应用编辑之前应用以下检查:
这应该适用于正在编辑的任何单元格。(因此失去焦点时不会应用编辑;键入 Enter 就足以应用编辑)
i knocked my head against the keyboard for the last hour to solve this issue.
here is my workaround:
looking at the problem: when selecting another cell (or any control within the gridview) EndEdit is triggered.
apply the following check before applying your edit:
This should apply to any cell being edited.(thus edit is not applied when losing focus; Typing Enter would suffice to apply the edit)
我的解决方法是捕获 CellMouseDown 事件,如果该操作是针对正在编辑的单元格之外的单元格,则它会发出 DataGridView.EndEdit()。 其他一切都按预期进行。
My work around was to capture the CellMouseDown event, and if the action was on a cell other than that being edited, then it issues the DataGridView.EndEdit(). Everything else works as expected.