如何忽略列表框中的过度选择

Question

目前我有 6 个列表框。我试图选择与手动选择的同一行中的所有其他 5 个列表框项目。

但是，我得到一个错误：

“System.StackOverflowException”类型的未处理异常 发生在 System.Windows.Forms.dll 中

无法计算表达式，因为当前线程在堆栈中 溢出状态。

下面是其中一个列表框的代码示例，对所有其他列表框重复。

private void listBox1_SelectedIndexChanged(object sender, EventArgs e) {

      listBox1.SelectedIndexChanged=1;
        listBox3.SelectedIndex = -1;
        listBox2.SelectedIndex = -1;
        listBox4.SelectedIndex = -1;
        listBox5.SelectedIndex = -1;
        listBox6.SelectedIndex = -1;
        listBox2.ClearSelected();
       listBox3.ClearSelected();
       listBox4.ClearSelected();
       listBox5.ClearSelected();
       listBox6.ClearSelected();
       int  a = listBox1.SelectedIndex;
       int b = listBox2.SelectedIndex;
       int c = listBox3.SelectedIndex;
       int d = listBox4.SelectedIndex;
       int f = listBox5.SelectedIndex;
       int g = listBox6.SelectedIndex;


        if (a >-1)
        {
           // listBox1.SetSelected(a,true);
            listBox2.SetSelected(a, true);
            listBox3.SetSelected(a, true);
            listBox4.SetSelected(a, true);
            listBox5.SetSelected(a, true);
            listBox6.SetSelected(a, true);
        }
        else if (b > -1)
        {
            listBox1.SetSelected(b, true);
           // listBox2.SetSelected(b, true);
            listBox3.SetSelected(b, true);
            listBox4.SetSelected(b, true);
            listBox5.SetSelected(b, true);
            listBox6.SetSelected(b, true);
        }
        else if (c > -1)
        {
            listBox1.SetSelected(c, true);
            listBox2.SetSelected(c, true);
         //   listBox3.SetSelected(c, true);
            listBox4.SetSelected(c, true);
            listBox5.SetSelected(c, true);
            listBox6.SetSelected(c, true);
        }
        else if (d > -1)
        {
            listBox1.SetSelected(d, true);
            listBox2.SetSelected(d, true);
            listBox3.SetSelected(d, true);
          //  listBox4.SetSelected(d, true);
            listBox5.SetSelected(d, true);
            listBox6.SetSelected(d, true);
        }
        else if (f > -1)
        {
            listBox1.SetSelected(f, true);
            listBox2.SetSelected(f, true);
            listBox3.SetSelected(f, true);
            listBox4.SetSelected(f, true);
           // listBox5.SetSelected(f, true);
            listBox6.SetSelected(f, true);
        }
        else if (g > -1)
        {
            listBox1.SetSelected(g, true);
            listBox2.SetSelected(g, true);
            listBox3.SetSelected(g, true);
            listBox4.SetSelected(g, true);
            listBox5.SetSelected(g, true);
           // listBox6.SetSelected(g, true);
        }


    }


    private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        listBox1.SelectedIndex = -1;
        listBox3.SelectedIndex = -1;
        listBox4.SelectedIndex = -1;
        listBox5.SelectedIndex = -1;
        listBox6.SelectedIndex = -1;
        listBox1.ClearSelected();
        listBox3.ClearSelected();
        listBox4.ClearSelected();
        listBox5.ClearSelected();
        listBox6.ClearSelected();
        int a = listBox1.SelectedIndex;
        int b = listBox2.SelectedIndex;
        int c = listBox3.SelectedIndex;
        int d = listBox4.SelectedIndex;
        int f = listBox5.SelectedIndex;
        int g = listBox6.SelectedIndex;


        if (a > -1)
        {
            // listBox1.SetSelected(a,true);
            listBox2.SetSelected(a, true);
            listBox3.SetSelected(a, true);
            listBox4.SetSelected(a, true);
            listBox5.SetSelected(a, true);
            listBox6.SetSelected(a, true);
        }
        else if (b > -1)
        {
            listBox1.SetSelected(b, true);
            // listBox2.SetSelected(b, true);
            listBox3.SetSelected(b, true);
            listBox4.SetSelected(b, true);
            listBox5.SetSelected(b, true);
            listBox6.SetSelected(b, true);
        }
        else if (c > -1)
        {
            listBox1.SetSelected(c, true);
            listBox2.SetSelected(c, true);
            //   listBox3.SetSelected(c, true);
            listBox4.SetSelected(c, true);
            listBox5.SetSelected(c, true);
            listBox6.SetSelected(c, true);
        }
        else if (d > -1)
        {
            listBox1.SetSelected(d, true);
            listBox2.SetSelected(d, true);
            listBox3.SetSelected(d, true);
            //  listBox4.SetSelected(d, true);
            listBox5.SetSelected(d, true);
            listBox6.SetSelected(d, true);
        }
        else if (f > -1)
        {
            listBox1.SetSelected(f, true);
            listBox2.SetSelected(f, true);
            listBox3.SetSelected(f, true);
            listBox4.SetSelected(f, true);
            // listBox5.SetSelected(f, true);
            listBox6.SetSelected(f, true);
        }
        else if (g > -1)
        {
            listBox1.SetSelected(g, true);
            listBox2.SetSelected(g, true);
            listBox3.SetSelected(g, true);
            listBox4.SetSelected(g, true);
            listBox5.SetSelected(g, true);
            // listBox6.SetSelected(g, true);
        }

}

Answer 1

您的代码可能正在更改代码中某处的 SelectedIndexChanged 事件中的索引。

尝试改用标志：

listBox1.SelectedIndexChanged += listBox_SelectedIndexChanged;
listBox2.SelectedIndexChanged += listBox_SelectedIndexChanged;
listBox3.SelectedIndexChanged += listBox_SelectedIndexChanged;

bool changingSelection = false;

void listBox_SelectedIndexChanged(object sender, EventArgs e) {
  if (!changingSelection) {
    int index = ((ListBox)sender).SelectedIndex;
    if (index > -1) {
      changingSelection = true;
      listBox1.SetSelected(index, true);
      listBox2.SetSelected(index, true);
      listBox3.SetSelected(index, true);
      changingSelection = false;
    }
  }
}