SelectedIndexChanged问题 [英] Problem with SelectedIndexChanged

问题描述

我有这段代码。

 private void cmbIndex（）
 {
 foreach（Control myControl in this.Controls）
 {
 ComboBox comboBox = myControl as ComboBox; 
 if（comboBox！= null&& comboBox.Items.Count> 0）
 {
 comboBox.SelectedIndex = 0; 
} 
} 
} 
 

这会选择所有组合框索引为零。但我有一个带有selectedindexchanged事件的组合框。

cmbIndex（）不再触发。我应该修改cmbIndex的代码吗？谢谢你

解决方案

如果我理解你想要使用这个方法来初始化/重新启动所有尚未选择索引的组合框控件。为此，您应该更改您的方法（因为 SelectedIndex ，其值 -1 表示未选择任何索引）：

  private   void  cmbIndex（）
 {
  foreach （控制myControl   这个 .Controls）
 {
 ComboBox comboBox = myControl  as  ComboBox; 
  if （comboBox！=  null && comboBox.Items.Count >   0 && comboBox.SelectedIndex <   0 ）
 {
 comboBox.SelectedIndex =  0 ; 
} 
} 
} 
 

  //  尝试此代码。 
  private   void  cmbIndex（）
 {
  foreach （控制c  in  此 .Controls）
 {
  foreach  （在 c.Controls中控制childc ）
 {
  if （childc   ComboBox）
 {
 ComboBox comboBox = childc  as  ComboBox; 
  if （comboBox！=  null && comboBox.Items.Count >   0 ）
 {
 comboBox.SelectedIndex =  0 ; 
} 
  //  （（ComboBox）childc）.SelectedIndex = 0;  
} 
} 
} 
} 

如有任何问题请告诉我。



- > M.U

Hi I have this code.

private void cmbIndex()
      {
          foreach (Control myControl in this.Controls)
          {
              ComboBox comboBox = myControl as ComboBox;
              if (comboBox != null && comboBox.Items.Count > 0)
              {
                  comboBox.SelectedIndex = 0;
              }
          }
      }

This selects all combo box index to zero. But I have one combo box with a selectedindexchanged event.
cmbIndex() does not fire anymore. Should I revise my codes for cmbIndex? Thank you

解决方案

If I understood correctly you want tu use this method to init/reinit all your combo box controls that do not have yet index selected. For doing that you should change your method like this (because SelectedIndex with value -1 means no index selected):

private void cmbIndex()
{
    foreach (Control myControl in this.Controls)
    {
        ComboBox comboBox = myControl as ComboBox;
        if (comboBox != null && comboBox.Items.Count > 0 && comboBox.SelectedIndex < 0)
        {
            comboBox.SelectedIndex = 0;
        }
    }
}

//try this code.
private void cmbIndex()
        {
  foreach (Control c in this.Controls)
        {
            foreach (Control childc in c.Controls)
            {
                if (childc is ComboBox)
                {
                 ComboBox comboBox = childc as ComboBox;
                if (comboBox != null && comboBox.Items.Count > 0)
                {
                    comboBox.SelectedIndex = 0;
                }
                  // ((ComboBox)childc).SelectedIndex = 0;
                }
            }
        }
        }

if any issue then let me know.

-> M.U

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