如何验证组合框 [英] how to validate a combobox

问题描述

我已将此方法用于必填字段组合框，但问题是.我想验证带有空格的组合框.我不想让用户在字符串的开头和结尾输入空格，也不想让用户一个接一个地输入多个空格，例如adil shaikh，我该如何实现呢?

i have used this method for required field combo box but the problem is. i want to validate combo box with spaces. i dont want user to enter spaces at the start and end of string and i dont want user to enter more than one whitespaces one after the other like adil shaikh how can i achive this?

public bool valcombo()
        {
            if (comboBox1.Text == string.Empty)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

推荐答案

您可以尝试以下操作:

You can try this:

public bool valcombo()
{
   //It will prevent space in begin, End and double space within the text
   if (comboBox1.Text.StartsWith(" ")|| comboBox1.Text.EndsWith(" ")|| comboBox1.Text.Contains("  "))
   {
       return true;
   }
   else
   {
       return false;
   }
}

您可以简单地使用它.

You can simply use this.

private Boolean valcombo(){
if ((comboBox1.Text.Length - comboBox1.Text.Trim().Length > 0) ||      

(comboBox1.Text.Trim().Length - comboBox1.Text.Trim().Replace(" ", "").Length > 1)) 
            
return true;
            
else
                
return false;    
        }

input               output

" adil shaikh"      true
"adil shaikh "      true
"adil   shaikh"      true
"adil shaikh"      false

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