需要截断Razor HTML DisplayFor Helper

Question

我试图截断一个有时非常大的文本字段,或者在其他时候从数据库中删除它,即

@Html.DisplayFor(modelItem => item.MainBiography)

并在最后用三个点替换.

我已经尝试过子串函数但不断出错.

任何指针,谢谢!

更新:

......并不是非常重要,所以我尝试使用

 @Html.DisplayFor(modelItem => item.MainBiography.Substring(0,10)) 

并获取以下错误代码:

System.InvalidOperationException未由用户代码处理HResult = -2146233079 Message = Templates只能用于字段访问,属性访问,单维数组索引或单参数自定义索引器表达式.Source = System.Web.Mvc -

Answer 1

你最好在模型中创建一个不同的属性,拿起MainBiography并最终缩短它.

像这样:

// This is your property (sampled)
public string MainBiography { get; set; }

//How long do you want your property to be at most ?
//(Best practice advices against magic numbers)
private int MainBiographyLimit = 100;

//You probably need this if you want to use .LabelFor() 
//and let this property mimic the "full" one  
[Display(Name="Main Biography")]
public string MainBiographyTrimmed
{
    get
    {
        if (this.MainBiography.Length > this.MainBiographyLimit)
            return this.MainBiography.Substring(0, this.MainBiographyLimit) + "...";
        else 
            return this.MainBiography;
    }
}

用法是

@Html.DisplayFor(item => item.MainBiographyTrimmed)

另一种方法是建立一个完整的视图模型,但我发现它经常过度杀戮.