asp.net-mvc 如何从 ASP.Net MVC modelState 获取所有错误？
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How to get all Errors from ASP.Net MVC modelState?
提问by chobo2
I want to get all the error messages out of the modelState without knowing the key values. Looping through to grab all the error messages that the ModelState contains.
我想在不知道键值的情况下从 modelState 中获取所有错误消息。循环获取 ModelState 包含的所有错误消息。
How can I do this?
我怎样才能做到这一点？
回答by mmutilva
回答by Oren Trutner
foreach (ModelState modelState in ViewData.ModelState.Values) {
foreach (ModelError error in modelState.Errors) {
DoSomethingWith(error);
}
}
See also How do I get the collection of Model State Errors in ASP.NET MVC?.
回答by Dunc
Building on the LINQ verison, if you want to join all the error messages into one string:
基于 LINQ 版本，如果您想将所有错误消息合并为一个字符串：
string messages = string.Join("; ", ModelState.Values
.SelectMany(x => x.Errors)
.Select(x => x.ErrorMessage));
回答by Yasser Shaikh
I was able to do this using a little LINQ,
我能够使用一点 LINQ 来做到这一点，
public static List<string> GetErrorListFromModelState
(ModelStateDictionary modelState)
{
var query = from state in modelState.Values
from error in state.Errors
select error.ErrorMessage;
var errorList = query.ToList();
return errorList;
}
The above method returns a list of validation errors.
上述方法返回验证错误列表。
Further Reading :
进一步阅读：
回答by Simon_Weaver
During debugging I find it useful to put a table at the bottom of each of my pages to show all ModelState errors.
在调试期间，我发现在每个页面的底部放置一个表格来显示所有 ModelState 错误很有用。
<table class="model-state">
@foreach (var item in ViewContext.ViewData.ModelState)
{
if (item.Value.Errors.Any())
{
<tr>
<td><b>@item.Key</b></td>
<td>@((item.Value == null || item.Value.Value == null) ? "<null>" : item.Value.Value.RawValue)</td>
<td>@(string.Join("; ", item.Value.Errors.Select(x => x.ErrorMessage)))</td>
</tr>
}
}
</table>
<style>
table.model-state
{
border-color: #600;
border-width: 0 0 1px 1px;
border-style: solid;
border-collapse: collapse;
font-size: .8em;
font-family: arial;
}
table.model-state td
{
border-color: #600;
border-width: 1px 1px 0 0;
border-style: solid;
margin: 0;
padding: .25em .75em;
background-color: #FFC;
}
</style>
回答by Alan Macdonald
As I discovered having followed the advice in the answers given so far, you can get exceptions occuring without error messages being set, so to catch all problems you really need to get both the ErrorMessage and the Exception.
正如我发现已经遵循了迄今为止给出的答案中的建议，您可以在没有设置错误消息的情况下发生异常，因此要捕获所有问题，您确实需要同时获取 ErrorMessage 和异常。
String messages = String.Join(Environment.NewLine, ModelState.Values.SelectMany(v => v.Errors)
.Select( v => v.ErrorMessage + " " + v.Exception));
or as an extension method
或作为扩展方法
public static IEnumerable<String> GetErrors(this ModelStateDictionary modelState)
{
return modelState.Values.SelectMany(v => v.Errors)
.Select( v => v.ErrorMessage + " " + v.Exception).ToList();
}
回答by james31rock
In case anyone wants to return the Name of the Model property for binding the error message in a strongly typed view.
如果有人想返回模型属性的名称以在强类型视图中绑定错误消息。
List<ErrorResult> Errors = new List<ErrorResult>();
foreach (KeyValuePair<string, ModelState> modelStateDD in ViewData.ModelState)
{
string key = modelStateDD.Key;
ModelState modelState = modelStateDD.Value;
foreach (ModelError error in modelState.Errors)
{
ErrorResult er = new ErrorResult();
er.ErrorMessage = error.ErrorMessage;
er.Field = key;
Errors.Add(er);
}
}
This way you can actually tie the error in with the field that threw the error.
通过这种方式，您实际上可以将错误与引发错误的字段联系起来。
回答by Josh Sutterfield
Outputting just the Error messages themselves wasn't sufficient for me, but this did the trick.
仅输出错误消息本身对我来说是不够的，但这确实有效。
var modelQuery = (from kvp in ModelState
let field = kvp.Key
let state = kvp.Value
where state.Errors.Count > 0
let val = state.Value?.AttemptedValue ?? "[NULL]"
let errors = string.Join(";", state.Errors.Select(err => err.ErrorMessage))
select string.Format("{0}:[{1}] (ERRORS: {2})", field, val, errors));
Trace.WriteLine(string.Join(Environment.NewLine, modelQuery));
回答by CodeArtist
For just in case someone need it i made and use the following static class in my projects
为了以防万一有人需要它，我制作并在我的项目中使用以下静态类
Usage example:
用法示例：
if (!ModelState.IsValid)
{
var errors = ModelState.GetModelErrors();
return Json(new { errors });
}
Usings:
用途：
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using WebGrease.Css.Extensions;
Class:
班级：
public static class ModelStateErrorHandler
{
/// <summary>
/// Returns a Key/Value pair with all the errors in the model
/// according to the data annotation properties.
/// </summary>
/// <param name="errDictionary"></param>
/// <returns>
/// Key: Name of the property
/// Value: The error message returned from data annotation
/// </returns>
public static Dictionary<string, string> GetModelErrors(this ModelStateDictionary errDictionary)
{
var errors = new Dictionary<string, string>();
errDictionary.Where(k => k.Value.Errors.Count > 0).ForEach(i =>
{
var er = string.Join(", ", i.Value.Errors.Select(e => e.ErrorMessage).ToArray());
errors.Add(i.Key, er);
});
return errors;
}
public static string StringifyModelErrors(this ModelStateDictionary errDictionary)
{
var errorsBuilder = new StringBuilder();
var errors = errDictionary.GetModelErrors();
errors.ForEach(key => errorsBuilder.AppendFormat("{0}: {1} -", key.Key,key.Value));
return errorsBuilder.ToString();
}
}
回答by Steve Lydford
Useful for passing array of error messages to View, perhaps via Json:
用于将错误消息数组传递给 View，可能是通过 Json：
messageArray = this.ViewData.ModelState.Values.SelectMany(modelState => modelState.Errors, (modelState, error) => error.ErrorMessage).ToArray();
