自动选择下拉列表中的唯一选项 [英] Autoselecting the only option in a dropdownlist

问题描述

我开发了一个名为dropdownlist3的Dropdownlist，它在Dropdownlist中只有一个项目，因此我希望自动选择该唯一选项，任何人都可以向我展示C#代码.请给我一个简短易懂的代码.我想要可以正常工作的确切编码.我迫切需要在我的工作场所使用它.我的
代码如下

I developed a Dropdownlist called dropdownlist3 which has only one item in the Dropdownlist.So I want that only option to be automatically selected.Can anyone please show me the C# code for that . please give me a very short and easy one.I want the exact coding that should be working fine.I need it urgently for my workplace. my
code is as follows

protected void Page_Load(object sender, EventArgs e)
      {
                  {
                        if (DropDownList3.Items.Count.Equals(1))
                        {
                          DropDownList3.Text = DropDownList3.Items[0].ToString();
                             
                        }
                  }
      }

Pratheep

Pratheep

推荐答案

if (DropDownList3.Items.Count == 1)
   DropDownList3.SelectedIndex = 0;

我认为DropDownList默认情况下选择第一项.

I think that DropDownList selects the first item by default.

如果您的下拉列表中只有一个项目，则默认情况下应选择它.
检查是否真的有一项没有空字符串.

If you have only one item in your dropdownlist, it should be selected by default.
Check if there is really one item and no empty strings.

尝试一下

protected void Page_Load(object sender, EventArgs e)
{
  if (DropDownList3.Items.Count>0)
  {
    DropDownList3.SelectedIndex = 0;
  }
  else
  {
    DropDownList3.SelectedIndex = -1;
  }
}

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