Html 如何在 ASP.NET MVC 中获取模型状态错误的集合？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/573302/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I get the collection of Model State Errors in ASP.NET MVC?
提问by Ryan Montgomery
How do I get the collection of errors in a view?
如何获取视图中的错误集合？
I don't want to use the Html Helper Validation Summary or Validation Message. Instead I want to check for errors and if any display them in specific format. Also on the input controls I want to check for a specific property error and add a class to the input.
我不想使用 Html Helper 验证摘要或验证消息。相反，我想检查错误以及是否以特定格式显示它们。同样在输入控件上，我想检查特定的属性错误并向输入添加一个类。
P.S. I'm using the Spark View Engine but the idea should be the same.
PS 我使用的是 Spark View Engine，但想法应该是一样的。
So I figured I could do something like...
所以我想我可以做一些像......
<if condition="${ModelState.Errors.Count > 0}">
DispalyErrorSummary()
</if>
....and also...
<input type="text" value="${Model.Name}"
class="?{ModelState.Errors["Name"] != string.empty} error" />
....
Or something like that.
或类似的东西。
UPDATE
更新
My final solution looked like this:
我的最终解决方案如下所示：
<input type="text" value="${ViewData.Model.Name}"
class="text error?{!ViewData.ModelState.IsValid &&
ViewData.ModelState["Name"].Errors.Count() > 0}"
id="Name" name="Name" />
This only adds the error css class if this property has an error.
如果此属性有错误，这只会添加错误 css 类。
回答by Chad Moran
<% ViewData.ModelState.IsValid %>
or
或者
<% ViewData.ModelState.Values.Any(x => x.Errors.Count >= 1) %>
and for a specific property...
并且对于特定的属性...
<% ViewData.ModelState["Property"].Errors %> // Note this returns a collection
回答by Chris McKenzie
To just get the errors from the ModelState, use this Linq:
要从 ModelState 中获取错误，请使用以下 Linq：
var modelStateErrors = this.ModelState.Keys.SelectMany(key => this.ModelState[key].Errors);
回答by Todd Menier
Condensed version of @ChrisMcKenzie's answer:
var modelStateErrors = this.ModelState.Values.SelectMany(m => m.Errors);
回答by UshaP
This will give you one string with all the errors with comma separating
这将为您提供一个字符串，其中包含逗号分隔的所有错误
string validationErrors = string.Join(",",
ModelState.Values.Where(E => E.Errors.Count > 0)
.SelectMany(E => E.Errors)
.Select(E => E.ErrorMessage)
.ToArray());
回答by Casey Crookston
Putting together several answers from above, this is what I ended up using:
将上面的几个答案放在一起，这就是我最终使用的：
var validationErrors = ModelState.Values.Where(E => E.Errors.Count > 0)
.SelectMany(E => E.Errors)
.Select(E => E.ErrorMessage)
.ToList();
validationErrorsends up being a List<string>that contains each error message. From there, it's easy to do what you want with that list.
validationErrors最终成为List<string>包含每个错误消息的 。从那里，您可以轻松地使用该列表执行您想要的操作。
回答by Rake36
Thanks Chad! To show all the errors associated with the key, here's what I came up with. For some reason the base Html.ValidationMessage helper only shows the first error associated with the key.
谢谢乍得！为了显示与密钥相关的所有错误，这是我想出的。出于某种原因，基本的 Html.ValidationMessage 助手只显示与键相关的第一个错误。
<%= Html.ShowAllErrors(mykey) %>
HtmlHelper:
HtmlHelper：
public static String ShowAllErrors(this HtmlHelper helper, String key) {
StringBuilder sb = new StringBuilder();
if (helper.ViewData.ModelState[key] != null) {
foreach (var e in helper.ViewData.ModelState[key].Errors) {
TagBuilder div = new TagBuilder("div");
div.MergeAttribute("class", "field-validation-error");
div.SetInnerText(e.ErrorMessage);
sb.Append(div.ToString());
}
}
return sb.ToString();
}
回答by MaylorTaylor
Here is the VB.
这里是VB。
Dim validationErrors As String = String.Join(",", ModelState.Values.Where(Function(E) E.Errors.Count > 0).SelectMany(Function(E) E.Errors).[Select](Function(E) E.ErrorMessage).ToArray())
回答by Gerard
If you don't know what property caused the error, you can, using reflection, loop over all properties:
如果您不知道是什么属性导致了错误，您可以使用反射循环遍历所有属性：
public static String ShowAllErrors<T>(this HtmlHelper helper) {
StringBuilder sb = new StringBuilder();
Type myType = typeof(T);
PropertyInfo[] propInfo = myType.GetProperties();
foreach (PropertyInfo prop in propInfo) {
foreach (var e in helper.ViewData.ModelState[prop.Name].Errors) {
TagBuilder div = new TagBuilder("div");
div.MergeAttribute("class", "field-validation-error");
div.SetInnerText(e.ErrorMessage);
sb.Append(div.ToString());
}
}
return sb.ToString();
}
Where T is the type of your "ViewModel".
其中 T 是“ViewModel”的类型。
