MVC自定義驗證屬性被默認ModelValidater..The值「空」改寫無效

我有一些布爾模型對象MVC自定義驗證屬性被默認ModelValidater..The值「空」改寫無效

[DisplayName("Is student still at school")] 
    //[ValidBoolDropDown("IsStillAtSchool")] 
    public bool? IsStillAtSchool { get; set; }

正在與一些布爾編輯器下拉菜單模板實現

@model bool? 
@{ 
    int intTabIndex = 1; 
    if (ViewData["tabindex"] != null) 
    { 
     intTabIndex = Convert.ToInt32(ViewData["tabindex"]); 
    } 
} 

@{ 
    string strOnChange = ""; 
    if (ViewData["onchange"] != null) 
    { 
     strOnChange = ViewData["onchange"].ToString(); 
    } 
} 

<div class="editor-field"> 
    @Html.LabelFor(model => model): 

    @Html.DropDownListFor(model => model, new SelectListItem[] { new SelectListItem() { Text = "Yes", Value = "true", Selected = Model == true ? true : false }, new SelectListItem() { Text = "No", Value = "false", Selected = Model == false ? true : false }, new SelectListItem() { Text = "Select", Value = "null", Selected = Model == null ? true : false} }, new { @tabindex = intTabIndex, @onchange = strOnChange }) 

    @Html.ValidationMessageFor(model => model) 
</div>

在後我仍然得到默認模型驗證錯誤

值「空」是無效的在校studentstill是。（又名IsStillatSchool）

我甚至實現了自定義ValidationAttribute

public class ValidBoolDropDown : ValidationAttribute 
{ 
    public ValidBoolDropDown(string dropdownname) :base("Please Select for {0}") 
    { 

     DropDownName = dropdownname; 
    } 

    private string DropDownName; 

    protected override ValidationResult IsValid(object value,ValidationContext validationContext) 
    { 


     var boolres = GetBool(validationContext); 

     //if (!boolres.HasValue) 
     //{ 
     // return new ValidationResult(FormatErrorMessage(validationContext.DisplayName)); 
     //} 

     return ValidationResult.Success; 
    } 

    public override string FormatErrorMessage(string name) 
    { 
     return string.Format(ErrorMessageString, name); 
    } 
    protected bool? GetBool(ValidationContext validationContext) 
    { 
     var propertyInfo = validationContext 
           .ObjectType 
           .GetProperty(DropDownName); 
     if (propertyInfo != null) 
     { 
      var boolValue = propertyInfo.GetValue(validationContext.ObjectInstance, null); 
      if (boolValue == null) 
       return null; 
      return boolValue as bool?; 
     } 
     return null; 
    } 
}

這大火，但被覆蓋和Model.Value.Error此屬性仍然未能

我看到一些關於轉動自動required標誌關閉在Glocal.asx

值類型

DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;

但是這並沒有worked..is它的情況下創建一個自定義MetadataValidatorProvider的應用程序或者是有s^omething別的事情上

感謝Adavance

來源

2012-04-20 HoopSnake

好，所以這個問題是在線路

@Html.DropDownListFor(model => model, new SelectListItem[] { new SelectListItem() { Text = "Yes", Value = "true", Selected = Model == true ? true : false }, new SelectListItem() { Text = "No", Value = "false", Selected = Model == false ? true : false }, **new SelectListItem() { Text = "Select", Value = "null", Selected = Model == null ? true : false}** }, new { @tabindex = intTabIndex, @onchange = strOnChange })

下拉模板，

新SelectListItem（）{文字= 「選擇」，Value =「null」，Selected = Model == null？真：假}

作爲萬阿英，蔣達清Selectlistitem

當默認模型綁定嘗試將表單數據綁定回到模型的字符串「null」不等於空（空對象）

一旦更改爲

new SelectListItem() { Text = "Select", Value = ""}

一切快樂工作和驗證attrribute得到完成其工作

感謝

ASP.NET MVC: DropDownList validation

：d

來源

2012-04-21 01:05:58 HoopSnake

MVC自定義驗證屬性被默認ModelValidater..The值「空」改寫無效

回答

相關問題