ModelStateDictionary不包含CopyTo的定义
本文关键字:定义 CopyTo 包含 ModelStateDictionary | 更新日期: 2023-09-27 17:55:02
.NET Core RC 1(完整的。NET框架)为我工作如下代码:
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(完整的。NET框架),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'不包含'CopyTo'和的定义没有扩展方法'CopyTo'接受类型的第一个参数可以找到'ModelStateDictionary'(您是否缺少一个using指令还是程序集引用?)
也许我需要将新的引用连接到ASP中不需要的程序集。. NET Core RC 1?
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)
);
,这应该在功能上等同于您在原始代码片段中所做的。