ASP.Net MVC 3将字符串属性绑定为string.Empty而不是null [英] ASP.Net MVC 3 bind string property as string.Empty instead of null

问题描述

模型是

public partial class BilingualString 
{ 
    public string RuString { get; set; } 
    public string EnString { get; set; } 
} 

public partial class Member 
{  
   public Member() 
   { 
       this.DisplayName = new BilingualString(); 
   } 
   public BilingualString DisplayName { get; set; } 
} 

如果用户不填写输入，则RuString的值和EnString为null.我需要string.Empty而不是null.

if user don't fill inputs the values of RuString and EnString is null. I need string.Empty instead of null.

像这样使用CustomModelBinder:

Using CustomModelBinder like this:

public class EmptyStringModelBinder : DefaultModelBinder 
{ 
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) 
    { 
        bindingContext.ModelMetadata.ConvertEmptyStringToNull = false; 
        return base.BindModel(controllerContext, bindingContext); 
    } 
} 

没有帮助.

推荐答案

使用此:

    [DisplayFormat(ConvertEmptyStringToNull=false)]
    public string RuString { get; set; }

OR

    private string _RuString;
    public string RuString {
        get {
            return this._RuString ?? "";
        }
        set {
            this._RuString = value ?? "";
        }
    }

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