ModelStateDictionary 不包含 CopyTo 的定义
ModelStateDictionary does not contain a definition for CopyTo
在 ASP.NET Core RC 1(完整的 .NET Framework)中,以下代码适用于我:
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.Filters;
using Microsoft.AspNet.Mvc.ModelBinding;
using Newtonsoft.Json;
namespace MyProject.Classes.Filters.ModelState
{
public class SetTempDataModelStateAttribute : ActionFilterAttribute
{
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
base.OnActionExecuted(filterContext);
var controller = filterContext.Controller as Controller;
if (controller != null)
{
var modelState = controller.ViewData.ModelState;
if (modelState != null)
{
var dictionary = new KeyValuePair<string, ModelStateEntry>[modelState.Count];
modelState.CopyTo(dictionary, 0);
var listError = dictionary.ToDictionary(m => m.Key, m => m.Value.Errors.Select(s => s.ErrorMessage).FirstOrDefault(s => s != null));
controller.TempData["ModelState"] = JsonConvert.SerializeObject(listError);
}
}
}
}
}
但是在ASP.NET Core 1.0 (full .NET Framework) 中,出现错误:
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Newtonsoft.Json;
namespace MyProject.Models.ModelState
{
public class SetTempDataModelStateAttribute : ActionFilterAttribute
{
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
base.OnActionExecuted(filterContext);
var controller = filterContext.Controller as Controller;
if (controller != null)
{
var modelState = controller.ViewData.ModelState;
if (modelState != null)
{
var dictionary = new KeyValuePair<string, ModelStateEntry>[modelState.Count];
modelState.CopyTo(dictionary, 0);
modelState = dictionary.[0];
var listError = dictionary.ToDictionary(m => m.Key, m => m.Value.Errors.Select(s => s.ErrorMessage).FirstOrDefault(s => s != null));
controller.TempData["ModelState"] = JsonConvert.SerializeObject(listError);
}
}
}
}
}
'ModelStateDictionary' does not contain a definition for 'CopyTo' and
no extension method 'CopyTo' accepting a first argument of type
'ModelStateDictionary' could be found (are you missing a using
directive or an assembly reference?)
也许我需要将新引用连接到 ASP.NET Core RC 1 中不需要的程序集?
ModelStateDictionary
没有实现 IDictionary<,>
因此没有 CopyTo
方法。在您的情况下,您可以将代码替换为
var listErrorr = modelState.ToDictionary(
m => m.Key,
m => m.Value.Errors
.Select(s => s.ErrorMessage)
.FirstOrDefault(s => s != null)
);
这在功能上应该与您在原始代码段中所做的相同。
在 ASP.NET Core RC 1(完整的 .NET Framework)中,以下代码适用于我:
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.Filters;
using Microsoft.AspNet.Mvc.ModelBinding;
using Newtonsoft.Json;
namespace MyProject.Classes.Filters.ModelState
{
public class SetTempDataModelStateAttribute : ActionFilterAttribute
{
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
base.OnActionExecuted(filterContext);
var controller = filterContext.Controller as Controller;
if (controller != null)
{
var modelState = controller.ViewData.ModelState;
if (modelState != null)
{
var dictionary = new KeyValuePair<string, ModelStateEntry>[modelState.Count];
modelState.CopyTo(dictionary, 0);
var listError = dictionary.ToDictionary(m => m.Key, m => m.Value.Errors.Select(s => s.ErrorMessage).FirstOrDefault(s => s != null));
controller.TempData["ModelState"] = JsonConvert.SerializeObject(listError);
}
}
}
}
}
但是在ASP.NET Core 1.0 (full .NET Framework) 中,出现错误:
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Newtonsoft.Json;
namespace MyProject.Models.ModelState
{
public class SetTempDataModelStateAttribute : ActionFilterAttribute
{
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
base.OnActionExecuted(filterContext);
var controller = filterContext.Controller as Controller;
if (controller != null)
{
var modelState = controller.ViewData.ModelState;
if (modelState != null)
{
var dictionary = new KeyValuePair<string, ModelStateEntry>[modelState.Count];
modelState.CopyTo(dictionary, 0);
modelState = dictionary.[0];
var listError = dictionary.ToDictionary(m => m.Key, m => m.Value.Errors.Select(s => s.ErrorMessage).FirstOrDefault(s => s != null));
controller.TempData["ModelState"] = JsonConvert.SerializeObject(listError);
}
}
}
}
}
'ModelStateDictionary' does not contain a definition for 'CopyTo' and no extension method 'CopyTo' accepting a first argument of type 'ModelStateDictionary' could be found (are you missing a using directive or an assembly reference?)
也许我需要将新引用连接到 ASP.NET Core RC 1 中不需要的程序集?
ModelStateDictionary
没有实现 IDictionary<,>
因此没有 CopyTo
方法。在您的情况下,您可以将代码替换为
var listErrorr = modelState.ToDictionary(
m => m.Key,
m => m.Value.Errors
.Select(s => s.ErrorMessage)
.FirstOrDefault(s => s != null)
);
这在功能上应该与您在原始代码段中所做的相同。