如果没有在文本框中输入任何内容，如何将默认值设置为零？ [英] how can I set a default value to zero if nothing is entered into the textbox?

问题描述

如果没有在文本框中输入任何内容，如何将默认值设置为零？

how can I set a default value to zero if nothing is entered into the textbox?

推荐答案

请参阅：Int32.TryParse [ ^ ]方法。



示例：

See: Int32.TryParse[^] method.

Example:

int result = 0;

if (!Int32.TryParse(TextBox1.Text, result))
    //conversion failed, default value of result is equal to 0 (zero)
else
    //conversion OK, result is eqaul to the value entered into TextBox ;)

根据帖子的评论，OP编写了代码

As per the comments to the post, OP had written code

If TextBox1.Text = "" Then
    TextBox1.Text = 0 
End If 
If TextBox2.Text = "" Then 
    TextBox2.Text = 0 
End If

即他们将数字0分配给字符串。

将代码更改为

I.e. they were assigning a numeric 0 to a string.
Changing the code to

If TextBox1.Text = "" Then
    TextBox1.Text = "0" 
End If 
If TextBox2.Text = "" Then 
    TextBox2.Text = "0" 
End If

解决了问题

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