在 .cshtml 模板中获取 MaxLength 值 [英] Get MaxLength value in .cshtml template

问题描述

在我的课堂上我有..

public class MyModel
{
    [MaxLength(30)]
    public string Name { get; set; }
}

在我看来..

@Html.AntiForgeryToken()
@Html.EditorForModel()

还有我的 String.cshtml

And my String.cshtml

@model string
@{ 
    // How to cetn MaxValue here ??
}

@Html.TextBox(Html.IdForModel().ToString(), Model, new { @class= "text-box single-line", placeholder=ViewData.ModelMetadata.Watermark })

推荐答案

这里是一些基本的代码，用于从属性中获取属性.

Here is some basic code to get an attribute off a property.

// use a nullable int to remember (or use a regular int and set a default, whatever your use-case is)
int? maxLength;
PropertyInfo[] props = typeof(MyModel).GetProperties();
foreach (PropertyInfo prop in props)
{
    object[] attrs = prop.GetCustomAttributes(true);
    foreach (object attr in attrs)
    {
        MaxLengthAttribute maxLengthAttr = attr as MaxLengthAttribute;
        if (maxLengthAttr != null &&  prop.Name.Equals("Name"))
        {

            maxLength = maxLengthAttr.Length
        }
    }
}

// check to make sure you got a value. opti
if (maxLength.HasValue)
{
// whatever you want to do
}

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