当我选择ComboBox时，所有剩余的ComboBox选定项都会被更改 [英] When i select the ComboBox all rest of ComboBox selected items are changed

问题描述

Iam根据输入动态创建ComboBox。当我选择第一个ComboBox值

其余的所有ComboBox也改变了。



Iam动态添加控件

 cmbSource =  new  ComboBox [dtExelData.Columns.Count]; 
 cmbDestination =  new  ComboBox [dtExelData.Columns.Count]; 
  for （ int  i =  0 ; i <  = dtExelData.Columns.Count  -   1 ; i ++）
 { 
 cmbSource [i] =  new  ComboBox（）; 
 cmbSource [i] .Name = Convert.ToString（  cmbSource + i）; 
 cmbSource [i] .Location =  new  Point（ 100 ，x）; 
  this  .Controls.Add（cmbSource [i]）; 
 cmbSource [i] .DataSource = lHeader; 
 
  //   MessageBox.Show（cmbSource [i] .Name.ToString（））;  
 
 cmbDestination [i] =  new  ComboBox（）; 
 cmbDestination [i] .Name = Convert.ToString（  cmbDest + i）; 
 cmbDestination [i] .Location =  new  Point（ 400 ，x）; 
  this  .Controls.Add（cmbDestination [i]）; 
 cmbDestination [i] .DataSource = dsTblColumns.Tables [ 0 ]; 
 cmbDestination [i] .DisplayMember =   column_name; 
 cmbDestination [i] .ValueMember =   column_name; 
 x = x +  40 ; 
} 

请告诉我如何解决这个问题？

解决方案

这是因为你们所有的组合框都使用相同的datasoruce。



每个组合框都必须有数据表。





最佳regrads

为了解决这个问题，我们将Datset复制到新数据集中并将组合框绑定到新数据集





cmbSource = new ComboBox [dtExelData.Columns.Count];

cmbDestination = new ComboBox [dtExelData.Columns.Count];

for（int i = 0; i< = dtExelData.Columns.Count - 1; i ++）

{

cmbSource [i] = new ComboBox（）;

cmbSource [i] .Name = Convert.ToString（cmbSource+ i）;

cmbSource [ i] .Location = new Point（70，x）;

PanelControls.Controls.Add（cmbSource [i]）;

DataTable newheaderdata = new DataTable（i.ToString（））;

newheaderdata = dsHeader.Tables [ 0] .Copy（）;

cmbSource [i] .DataSource = newheaderdata;

cmbSource [i] .DisplayMember = name;

cmbSource [i] .ValueMember =name;

// MessageBox.Show（cmbSource [i] .Name.ToString（））;

cmbDestination [i] = new ComboBox（）;

cmbDestination [i] .Name = Convert.ToString（cmbDest+ i）;

cmbDestination [i] .Location = new Point（300，x）;

PanelControls.Controls.Add（cmbDestination [i]）;



DataTable newData = new DataTable（i.ToString（））;

newData = dsTblColumns.Tables [0]。复制（）;

cmbDestination [i] .DataSource = newData;

cmbDestination [i] .DisplayMember =name ;

cmbDestination [i] .ValueMember =name;



x = x + 40;

}

Iam Creating The ComboBox Dynamically Based on input . When i select first ComboBox value
rest of The all ComboBox also changed .

Iam Adding Controls Dynamically

cmbSource = new ComboBox[dtExelData.Columns.Count];
               cmbDestination = new ComboBox[dtExelData.Columns.Count];
               for (int i = 0; i <= dtExelData.Columns.Count - 1; i++)
               {
                   cmbSource[i] = new ComboBox();
                   cmbSource[i].Name = Convert.ToString("cmbSource" + i);
                   cmbSource[i].Location = new Point(100, x);
                   this.Controls.Add(cmbSource[i]);
                   cmbSource[i].DataSource = lHeader;

                   // MessageBox.Show(cmbSource[i].Name.ToString());

                   cmbDestination[i] = new ComboBox();
                   cmbDestination[i].Name = Convert.ToString("cmbDest" + i);
                   cmbDestination[i].Location = new Point(400, x);
                   this.Controls.Add(cmbDestination[i]);
                   cmbDestination[i].DataSource = dsTblColumns.Tables[0];
                   cmbDestination[i].DisplayMember = "column_name";
                   cmbDestination[i].ValueMember = "column_name";
                   x = x + 40;
               }

Please let me know how solve this ?

解决方案

this is because your all comboboxs use same datasoruce .

for every combobox you must have a datasoruce .


best regrads

To Resovle This Problem we have Copy The Datset into New Dataset And Bind The combobox with new dataset


cmbSource = new ComboBox[dtExelData.Columns.Count];
cmbDestination = new ComboBox[dtExelData.Columns.Count];
for (int i = 0; i <= dtExelData.Columns.Count - 1; i++)
{
cmbSource[i] = new ComboBox();
cmbSource[i].Name = Convert.ToString("cmbSource" + i);
cmbSource[i].Location = new Point(70, x);
PanelControls.Controls.Add(cmbSource[i]);
DataTable newheaderdata = new DataTable(i.ToString());
newheaderdata = dsHeader.Tables[0].Copy();
cmbSource[i].DataSource = newheaderdata;
cmbSource[i].DisplayMember = "name";
cmbSource[i].ValueMember = "name";
// MessageBox.Show(cmbSource[i].Name.ToString());
cmbDestination[i] = new ComboBox();
cmbDestination[i].Name = Convert.ToString("cmbDest" + i);
cmbDestination[i].Location = new Point(300, x);
PanelControls.Controls.Add(cmbDestination[i]);

DataTable newData = new DataTable(i.ToString());
newData = dsTblColumns.Tables[0].Copy();
cmbDestination[i].DataSource = newData;
cmbDestination[i].DisplayMember = "name";
cmbDestination[i].ValueMember = "name";

x = x + 40;
}

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