我想在不知道键值的情况下获得modelState中的所有错误消息。循环获取ModelState包含的所有错误消息。
我该怎么做呢?
我想在不知道键值的情况下获得modelState中的所有错误消息。循环获取ModelState包含的所有错误消息。
我该怎么做呢?
当前回答
使用LINQ:
IEnumerable<ModelError> allErrors = ModelState.Values.SelectMany(v => v.Errors);
其他回答
在调试过程中,我发现在每个页面的底部放置一个表来显示所有ModelState错误是很有用的。
<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>
我发现,按照到目前为止给出的答案中的建议,可以在不设置错误消息的情况下获得发生异常的情况,因此要捕获所有问题,确实需要同时获取ErrorMessage和Exception。
String messages = String.Join(Environment.NewLine, ModelState.Values.SelectMany(v => v.Errors)
.Select( v => v.ErrorMessage + " " + v.Exception));
或者作为一种扩展方法
public static IEnumerable<String> GetErrors(this ModelStateDictionary modelState)
{
return modelState.Values.SelectMany(v => v.Errors)
.Select( v => v.ErrorMessage + " " + v.Exception).ToList();
}
<div class=“textdanger”样式=“direction:rtl”asp-validation-summary=“All”></div>
简单地使用asp-validation-summary标签助手
对于AJAX请求更好的解决方案:
public IActionResult Demo(DemoInfo formData)
{
if (!ModelState.IsValid)
{
IEnumerable<object> formErrors = ModelState.Select((s) => new {
fieldName = s.Key,
fieldValue = s.Value.RawValue,
fieldMessage = s.Value.Errors.FirstOrDefault()?.ErrorMessage
});
return Json(new { formValid = 0, formErrors });
}
return Json(new { formValid = 1 });
}
回应格式为:
{"formValid":0,
"formErrors":[{
"fieldName":"name of field from object",
"fieldValue":"value from browser",
"fieldMessage":null /*Error message from model annotations if field is valid the value will be null */
}]
}
有关Func<>的更多详细信息,请查看本页:Func<TSource,Int32,TResult>)
这是对@Dunc的回答的扩展。参见xml文档注释
// ReSharper disable CheckNamespace
using System.Linq;
using System.Web.Mvc;
public static class Debugg
{
/// <summary>
/// This class is for debugging ModelState errors either in the quick watch
/// window or the immediate window.
/// When the model state contains dozens and dozens of properties,
/// it is impossible to inspect why a model state is invalid.
/// This method will pull up the errors
/// </summary>
/// <param name="modelState">modelState</param>
/// <returns></returns>
public static ModelError[] It(ModelStateDictionary modelState)
{
var errors = modelState.Values.SelectMany(x => x.Errors).ToArray();
return errors;
}
}