如何将空值传递给asp.net中的标签 [英] how to pass null value to label in asp.net

问题描述

如何将空值传递给asp.net中的标签?

how to pass null value to label in asp.net??

label.Text =null;
label.Text="";
label.Text=DBNULL;

不起作用??????

not working?????

推荐答案

label.Text = string.Empty;

如果要让标签显示空"，则只需分配string.Empty.

If you want a label to display ''empty'', just assign string.Empty.

在这种情况下，您需要为DataTime字段传递DbNull.Value.
请参考如何传递空值到asp.net中的datetime数据类型? [

You need to pass DbNull.Value for DataTime field in this case.
Please refer How to pass the null value to datetime datatype in asp.net?[^] for the same type of issue.

Thanks...

如果设置为空，标签文本将始终为空白(")而不为null.因此，您可以使用以下代码:-

if you set null label text will always be blank ("") and not null. hence, you can use the following:-

protected void Page_Load(object sender, EventArgs e)
{
    Label1.Text = string.Empty ; // OR  Label1.Text = null ; 
    Label2.Text = (String.IsNullOrEmpty(Label1.Text) ? "null" : "not null");
}

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