我们如何将正则表达式添加到从TextBox继承的customcontrol中. [英] How can we add a regex to the customcontrol inherited from TextBox.

问题描述

public override void RenderBeginTag(HtmlTextWriter writer)
        {            
            // Set the maxlength and the min length using regex for multiline textboxes...
            RegularExpressionValidator rev = new RegularExpressionValidator { ControlToValidate = ClientID, ValidationExpression = @"^[\s\S]{" + MinLength + "," + (MaxLength == 0 ? 1000000 : MaxLength) + "}$", ErrorMessage = "Please enter a valid length." };
            this.Parent.Controls.Add(rev);
// The prev line is giving error:
// Collection was modified; enumeration operation may not execute.
// Even tried the above in Onprerender also, but no luck.

            base.RenderBeginTag(writer);
        }

推荐答案

"，ErrorMessage = }; 此 .Parent.Controls.Add(rev); // 上一行显示错误: // 集合已修改；枚举操作可能无法执行. // 甚至在Onprerender中也尝试了上述方法，但是没有运气. 基本 .RenderBeginTag(writer); }

", ErrorMessage = "Please enter a valid length." }; this.Parent.Controls.Add(rev); // The prev line is giving error: // Collection was modified; enumeration operation may not execute. // Even tried the above in Onprerender also, but no luck. base.RenderBeginTag(writer); }

您需要用户控件，而不是自定义控件.您正在做的事情有点骇人听闻，您是在使用错误的工具来完成工作.

You want a user control, not a custom control. What you''re doing is a bit of a hack, you''re using the wrong tools for the job.

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