从类型“System.String”到类型“System.Boolean”的参数转换失败

Question

验证后，我在复选框上的 MVC 中遇到错误。我已检查该属性的值为 True 但我仍然收到相同的错误。

 @Html.CheckBoxFor(m => m.IsCardForSaving, new { @class = "savecard" })

例外：

System.InvalidOperationException was unhandled by user code   HResult=-2146233079   Message=The parameter conversion from type 'System.String' to type 'System.Boolean' failed. See the inner exception for more information.   Source=System.Web.Mvc   StackTrace:
       at System.Web.Mvc.ValueProviderResult.ConvertSimpleType(CultureInfo culture, Object value, Type destinationType)
       at System.Web.Mvc.HtmlHelper.GetModelStateValue(String key, Type destinationType)
       at System.Web.Mvc.Html.InputExtensions.InputHelper(HtmlHelper htmlHelper, InputType inputType, ModelMetadata metadata, String name, Object value, Boolean useViewData, Boolean isChecked, Boolean setId, Boolean isExplicitValue, String format, IDictionary`2 htmlAttributes)
       at System.Web.Mvc.Html.InputExtensions.CheckBoxHelper(HtmlHelper htmlHelper, ModelMetadata metadata, String name, Nullable`1 isChecked, IDictionary`2 htmlAttributes)
       at System.Web.Mvc.Html.InputExtensions.CheckBoxFor[TModel](HtmlHelper`1 htmlHelper, Expression`1 expression, IDictionary`2 htmlAttributes)
       at ASP._Page_Views_Payment_EditorTemplates_PaymentDetails_cshtml.Execute() in f:\FPNext-Latest\FPNext-COA\FPNext\Views\Payment\EditorTemplates\PaymentDetails.cshtml:line 82
       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
       at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
       at System.Web.Mvc.Html.TemplateHelpers.ExecuteTemplate(HtmlHelper html, ViewDataDictionary viewData, String templateName, DataBoundControlMode mode, GetViewNamesDelegate getViewNames, GetDefaultActionsDelegate getDefaultActions)
       at System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData, ExecuteTemplateDelegate executeTemplate)
       at System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData)
       at System.Web.Mvc.Html.TemplateHelpers.TemplateFor[TContainer,TValue](HtmlHelper`1 html, Expression`1 expression, String templateName, String htmlFieldName, DataBoundControlMode mode, Object additionalViewData)
       at System.Web.Mvc.Html.EditorExtensions.EditorFor[TModel,TValue](HtmlHelper`1 html, Expression`1 expression)
       at ASP._Page_Views_Payment_Air_cshtml.Execute() in f:\FPNext-Latest\FPNext-COA\FPNext\Views\Payment\Air.cshtml:line 182
       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
       at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
       at System.Web.WebPages.StartPage.ExecutePageHierarchy()
       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
       at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
       at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17()
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)   InnerException: System.FormatException
       HResult=-2146233033
       Message=true,false is not a valid value for Boolean.
       Source=System
       StackTrace:
            at System.ComponentModel.BooleanConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
            at System.Web.Mvc.ValueProviderResult.ConvertSimpleType(CultureInfo culture, Object value, Type destinationType)
       InnerException: System.FormatException
            HResult=-2146233033
            Message=String was not recognized as a valid Boolean.
            Source=mscorlib
            StackTrace:
                 at System.Boolean.Parse(String value)
                 at System.ComponentModel.BooleanConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
            InnerException:

Answer 1

编辑：

复选框助手会自动发出一个带有 false 值的附加隐藏字段。

所以如果复选框被选中，浏览器会为这个复选框发送两个值，“1”和false（非数组类型优先为1），否则只会发送false。

：

1) 更改您的住宿名称

2) 解决此问题的另一种方法 (that I have discovered to be a good practice) 是避免模型中的“不可为空”字段。

3) 检查同样的问题：The parameter conversion from type 'System.String' to type ''X' failed because no type converter can convert between these types

更新：

更多解决方案

asp.net mvc checkbox inconsistency

Error msg: Failed to convert parameter value from a String to a Boolean

http://mvc3withrazorviewengine.blogspot.in/

Answer 2

首先确保IsCardForSaving 属性是布尔值而不是字符串：

public bool IsCardForSaving { get; set; }

我已检查该属性的值为 True

C# 中布尔字段的正确值是 true，而不是 True。

---

更新：

现在您已经显示了异常堆栈跟踪，您的视图中似乎还有另一个同名的输入字段IsCardForSaving。 CheckBoxFor 帮助器生成一个具有相同名称的附加隐藏字段，但这没关系，因为它的值是 false。这是必需的，因为在 HTML 中，仅当您选中复选框时，其值才会发送到服务器。所以你得到了这个：

<input type="checkbox" name="IsCardForSaving" />
<input type="hidden" name="IsCardForSaving" value="false" />

没关系。现在寻找其他一些输入元素，除了具有相同name="IsCardForSaving" 的那些 2。

Answer 3

问题是你的动作参数的名称

public ActionResult Deneme(DenemeModel model)

改成

public ActionResult Deneme(DenemeModel request)