您好，我想比较两个文本框值，验证C＃Windows窗体中的两个文本框 [英] Hi I Want To Compare Two Text Box Values, Validate Two Textboxes In C# Windows Forms

问题描述

您好我要比较两个文本框值，验证c＃Windows窗体中的两个文本框



ex：

fromtxt1 = 500000

Totxt2 = 600000



验证这些文本框，deos不允许totxt值小于Fromtxt值

Hi i want to compare two text box values, validate two textboxes in c# Windows Forms

ex:
fromtxt1 = 500000
Totxt2 = 600000

validate these textboxes, deos not allow totxt value smaller than Fromtxt value

推荐答案

将其转换为INT，然后将其与按钮的OnClick或OnTextChanged事件等进行比较。



示例：

Convert it into INT and then compare it wherever you want like OnClick of the button or OnTextChanged event etc.

Example:

int ValueTo= Convert.ToInt32(Totxt2.Text);
int ValueFrom = Convert.ToInt32(fromtxt1.Text);
private void ValueFrom_TextChanged(object sender, EventArgs e)
{
   try
   {
      if(ValueTo < ValueFrom )
      {
         //Message here
      }
   }
   catch
   {
      // If there is an error
   }
}

根据建议，将字符串转换为数值并比较后者，例如

As suggested, convert the strings into numeric values and the compare the latters, e.g.

bool validate()
{
  int f, t;
  if ( int.TryParse(fromtxt1, out f) == false || int.TryParse(Totxt2, out t) == false )
    return false;

  return (f <= t);
}

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