C# 更改绑定到 DataGridView 的 DataTable 中的列顺序不会反映在视图中
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Changing column order in DataTable bound to DataGridView does not reflect in the view
提问by Brendan
When the application is run, the DataGridViewis bound to a DataTable. Later I add more columns to the DataTableprogrammatically and it is reflected in the underlying data - i.e. the column Ordinals are as they should be. However this is not reflected in the DataGridView. Instead columns are appended onto the originally generated set.
当应用程序运行时，DataGridView绑定到DataTable. 后来我以DataTable编程方式向其中添加了更多列，并反映在基础数据中 - 即列序号是它们应有的样子。然而，这并没有反映在DataGridView. 而是将列附加到最初生成的集合上。
This example demonstrates,
这个例子演示了，
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public DataTable data = new DataTable();
private void button1_Click(object sender, EventArgs e)
{
this.dataGridView1.DataSource = data;
for (int i = 0; i < 5; i++)
{
this.data.Columns.Add(i.ToString());
}
}
private void button2_Click(object sender, EventArgs e)
{
DataColumn foo = new DataColumn();
this.data.Columns.Add(foo);
foo.SetOrdinal(0);
}
private void button3_Click(object sender, EventArgs e)
{
foreach (DataColumn tmpCol in this.data.Columns)
{
Console.WriteLine("{0} : {1}", tmpCol.ColumnName, tmpCol.Ordinal);
}
}
}
Button 1 generates the columns, button 2 adds a column and sets the ordinal to 0 so it should be first in the grid, button 3 displays the ordinals of the columns and shows they are how they should be in the DataTable.
按钮 1 生成列，按钮 2 添加一列并将序数设置为 0，因此它应该在网格中的第一个，按钮 3 显示列的序数并显示它们在DataTable.
采纳答案by Marc Gravell
That is just how DataGridViewworks; with auto-generate columns enabled, extra (unmapped) columns are appended to the end. You can unbind and re-bind to fix it; set the DataSource to null and back to the table:
这就是DataGridView工作原理；启用自动生成列后，额外的（未映射的）列会附加到末尾。您可以解除绑定并重新绑定以修复它；将 DataSource 设置为 null 并返回到表：
this.dataGridView1.DataSource = null;
this.dataGridView1.Columns.Clear();
this.dataGridView1.DataSource = data;
回答by Koryu
I had a similar problem and solved it with the DataGridViewColumn.DisplayIndex property.
我有一个类似的问题，并使用 DataGridViewColumn.DisplayIndex 属性解决了它。
dgvData.Columns["COLUMN_NAME"].DisplayIndex = 0; // will move your custom column to first position
回答by Shawn
Don't forget to turn on and off AutoColumnCreate to ensure that you'r DisplatIndex's work.
不要忘记打开和关闭 AutoColumnCreate 以确保您是 DisplatIndex 的工作。
http://www.internetworkconsulting.net/content/datadridview-displayorder-not-working
http://www.internetworkconsulting.net/content/datadridview-displayorder-not-working
