验证文本框 [英] validation on atext box

问题描述

嗨！

我创建了一个具有两个文本框的表单

在文本框1中用于用户ID

小写字母仅允许使用-"和字母"

我如何验证文本box1

hi!

i create a form which has two text box

in text box1 is for user id

where only "-" and "alphabets" are allowed in lower case

how i have to validate the text box1

推荐答案

处理TextBox.KeyPress事件:

Handle the TextBox.KeyPress event:

private void myTextBox_KeyPress(object sender, KeyPressEventArgs e)
    {
    if (!((e.KeyChar >= ''a'' && e.KeyChar <= ''z'') || e.KeyChar == ''-''))
        {
        e.Handled = true;
        }
    }

我启用此功能，请告诉我我必须对-"使用什么，因为分隔符不起作用"

"i make this function can u please tell me what i have to use for "-" becouse seperator is not working"

private string RemoveNonAlphabets(string str)
            {	
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < str.Length; i++)
                {	
                    if(char.IsLetter(str[i]) || char.IsSeparator(str[i]))
                    sb.Append(str[i]);	
                }	return sb.ToString();
            }

要满足您最初的问题目标，请使用IsLower而不是IsLetter-后者允许使用"A" ..''Z"以及"a" .. z"

不要使用IsSeparator-它会检查:

To meet your original question objectives, use IsLower rather than IsLetter - the latter allows ''A''..''Z'' as well as ''a''..''z''

Don''t use IsSeparator - it checks for:

The Unicode standard recognizes three subcategories of separators:
Space separators (the UnicodeCategory.SpaceSeparator category), which includes characters such as \u0020.
Line separators (the UnicodeCategory.LineSeparator category), which includes \u2028.
Paragraph separators (the UnicodeCategory.ParagraphSeparator category), which includes \u2029.

(来自MSDN: http://msdn.microsoft.com/en-us/library/cta536cf.aspx [ ^ ])
在上面的示例中使用-".

(Taken from MSDN: http://msdn.microsoft.com/en-us/library/cta536cf.aspx[^])
Use ''-'' as in my example above.

我假设您的意思是一个ASP.NET页面，如果是这种情况，请在下面尝试，

I assume you mean a ASP.NET page, if that is the situation then please try below,

<asp:TextBox ID="txtTest" runat="server"></asp:TextBox>
<asp:RegularExpressionValidator ID="reValidatorTextBox" ControlToValidate="txtTest"
    ValidationExpression="^[a-zA-Z-]+

" runat = " ErrorMessage = " 仅字母和-" ">< / asp:RegularExpressionValidator > < asp:按钮ID = " runat = " Text = " />

" runat="server" ErrorMessage="Only alphabets and -"></asp:RegularExpressionValidator> <asp:Button ID="btnTest" runat="server" Text="Button" />

希望对您有所帮助:)

Hope it might help you :)

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