c＃DataGridview Combobox Comlumn未显示所选值 [英] c# DataGridview Combobox Comlumn not displaying selected value

问题描述

我正在使用普通的Datagridview，但我遇到了问题。

这样我在网格中填充数据并向其中添加了combobox列

 db.DataEntities ss =  new  db.DataEntities（）; 
 DataGridview1.DataSource = ss.table1.ToList（）; 
 
  if （！DataGridview1.Columns.Contains（  dgcolUser））
 {
 DataGridViewComboBoxColumn dgcombocolUser =  new  DataGridViewComboBoxColumn（）; 
 dgcombocolUser.Name =   dgcolUser; 
 
  var  listOfAllUsers = ss.secAccountInformations.ToList（）; 
 dgcombocolUser.DataSource = listOfAllUsers; 
 dgcombocolUser.DisplayMember =   AccountName; 
 dgcombocolUser.ValueMember =   UserId; 
 DataGridview1.Columns.Add（dgcombocolUser）; 
} 
 
  foreach （DataGridViewRow dgr  in  DataGridview1.Rows） 
 {
 dgr.Cells [  dgcolUser]。值= dgr。单元格[  PermittedUserId]。值; 
} 
 

我在MDI父母面前打开此表格

< pre lang =c＃> Form1 frm = new Form1（）{MdiParent = MdiForm1};
frm.Show（）;

当我打开表单时它没有在Comboboxcolumn中显示任何选定的值

但是当我打开我的Form frm1而不是它MdiParent它在Combobox列中显示选定的值

 Form1 frm =  new  Form1（ ）; 
 frm.Show（）; 
 

所以这真的发生了，因为它在我没有MdiParnet显示我的表单时显示数据，或者是否有任何其他原因因为它没有发生< br>

请给我更好的建议..因为显示没有MdiParent的形式是无效的解决方案。

解决方案

我遇到了同样的问题。我相信你正在填写表格Load事件上的DGV。如果您将该代码移动到Form Activivate，那么这应该在MDI表单中

I am using a normal Datagridview but I have a problem with it.
This way I am filling data in my grid and adding combobox column to it

db.DataEntities ss = new db.DataEntities();
  DataGridview1.DataSource = ss.table1.ToList();

  if (!DataGridview1.Columns.Contains("dgcolUser"))
  {
      DataGridViewComboBoxColumn dgcombocolUser = new DataGridViewComboBoxColumn();
      dgcombocolUser.Name = "dgcolUser";

      var listOfAllUsers = ss.secAccountInformations.ToList();
      dgcombocolUser.DataSource = listOfAllUsers;
      dgcombocolUser.DisplayMember = "AccountName";
      dgcombocolUser.ValueMember = "UserId";
      DataGridview1.Columns.Add(dgcombocolUser);
  }

  foreach ( DataGridViewRow dgr in DataGridview1.Rows)
  {
      dgr.Cells["dgcolUser"].Value = dgr.Cells["PermittedUserId"].Value;
  }

I am opening this Form in a MDI parent

Form1 frm = new Form1() { MdiParent = MdiForm1};
frm.Show();

when I open my form it not displaying any selected value in Comboboxcolumn
But when I open my Form frm1 not it MdiParent it display selected value in Comboboxcolumn

Form1 frm = new Form1();
frm.Show();

so is this really happen because it shows data when i am showing my form without MdiParnet or is there any other reason due to which it is not happening<br>
Please give me better suggesstion.. because showing form without MdiParent is not valid solution.

解决方案

I had the same problem. I believe you are populating the DGV on form Load event. If you move that code to Form Activivate then this should work within MDI form

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