如何设置属性网格项的最大长度 [英] How do I set maximuml length of property grid item

问题描述

Category(All)]
       [StringLength(40)]
       [DisplayName(ITEMNAME)]
       [XmlAttribute]
       public override string Label
       {
           get
           {
               return base.Label;
           }
           set
           {

               value = value.TrimEnd();   ignorieren


               if (value.length > 40)
               {
                //here I want a user not to allow to write more than 40 char
                  when user write something in  Name feild max Length 40 i want a user to allow

               }


           }
       }

这是我的ITEMNAME属性网格视图的代码我想要的值不应该超过40，最大值是40所以我想做的是当用户输入av时alue grater比40想要使属性feild禁用，以便用户可以#t输入更多。

经过研究我发现了一个stringLength属性（System.ComponentModel.DataAnnotations）但它似乎没有任何帮助我在这个或者thete是解决这个问题的另一种方法吗？

This is my code for Property grid view for ITEMNAME i want that value should not be longer han 40 , max value is 40 so what i want to do is that when user enter a value grater than 40 want to make property feild disabled so that user can#t enter more.
After researching i found a stringLength attribute(System.ComponentModel.DataAnnotations) but its seems to be not working anyone help me in this or thete is another way to solve This ???????????

推荐答案

它是mvc还是标准网页表单？



System.ComponentModel.DataAnnotations用于MVC

ex：

it's mvc or standard web forms ?

System.ComponentModel.DataAnnotations is used with MVC
ex :

public class User
{
    [Required(ErrorMessage = "Name is required.")]
    [MaxLength(40, ErrorMessage = "Name cannot be longer than 40 characters.")]
    public string Name { get; set; }
}

网页表格你可以使用正则表达式验证器

with web forms you can use regex validator

<asp:RegularExpressionValidator runat="server" ID="valInput"

    ControlToValidate="txtInput"

    ValidationExpression="^[\s\S]{0,40}

ErrorMessage = 请输入最多40个字符

显示 = 动态 > * < / asp：RegularExpressionValidator >

" ErrorMessage="Please enter a maximum of 40characters" Display="Dynamic">*</asp:RegularExpressionValidator>

如果它只是你需要截断的显示你可以使用css和省略号

if it is only the display that you need to truncate you can use css and ellipsis

.truncate {
  width: 250px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

用于Windo ws表单应用程序我正在使用.Net 3.5但它不支持MaxLength属性我添加了.dll并使用System.ComponentModel.DataAnnotations

its for Windows Form Application i am working with .Net 3.5 but its not supporting MaxLength attribute i have added .dll and using System.ComponentModel.DataAnnotations

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