asp.net-mvc 必需属性在 asp.net mvc 中不起作用
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/19734608/
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
required attribute not working in asp.net mvc
提问by user2465036
I have a simple strongly-typed view.
我有一个简单的强类型视图。
@model GoldForGold.Models.LogonModel
@{
ViewBag.Title = "Logins";
Layout = "~/Views/Shared/_Layout.cshtml";
}
Logins
@using (Html.BeginForm()) {
Account Information
@Html.LabelFor(m => m.UserName)
@Html.TextBoxFor(m => m.UserName, new { id = "txtUserName" })
@Html.ValidationMessageFor(m => m.UserName)
@Html.LabelFor(m => m.Password)
@Html.PasswordFor(m => m.Password, new { id = "txtPassword" })
@Html.ValidationMessageFor(m => m.Password)
@Html.CheckBoxFor(m => m.RememberMe)
@Html.LabelFor(m => m.RememberMe)
<input type="submit" value="Log On" onclick="getcredentials()" />
}
Model code is here.
模型代码在这里。
public class LogonModel
{
[Required(ErrorMessage="please enter username")]
[Display(Name = "User name")]
public string UserName { get; set; }
[Required]
[DataType(DataType.Password)]
[Display(Name = "Password")]
public string Password { get; set; }
[Display(Name = "Remember me?")]
public bool RememberMe { get; set; }
}
I see nothing is happening even when I do not enter username and password.
即使我没有输入用户名和密码，我也看不到任何事情发生。
回答by Vahagn Nahapetyan
Here is the complete solution:
这是完整的解决方案：
Add the following scripts to your view:
<script src='@Url.Content("~/Scripts/jquery-1.8.2.js")' type='text/javascript'></script> <script src='@Url.Content("~/Scripts/jquery.validate.js")' type='text/javascript'> </script> <script src='@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")' type='text/javascript'></script>Enable Validation in Web.Config:
<appSettings> <add key="ClientValidationEnabled" value="true" /> <add key="UnobtrusiveJavaScriptEnabled" value="true" /> </appSettings>Add validation element in the view:
@Html.ValidationMessageFor(model => model.UserName)Add Required attribute to you model`s element.
[Required(ErrorMessage="please enter username")] public string UserName { get; set; }
将以下脚本添加到您的视图中：
<script src='@Url.Content("~/Scripts/jquery-1.8.2.js")' type='text/javascript'></script> <script src='@Url.Content("~/Scripts/jquery.validate.js")' type='text/javascript'> </script> <script src='@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")' type='text/javascript'></script>在 Web.Config 中启用验证：
<appSettings> <add key="ClientValidationEnabled" value="true" /> <add key="UnobtrusiveJavaScriptEnabled" value="true" /> </appSettings>在视图中添加验证元素：
@Html.ValidationMessageFor(model => model.UserName)向您的模型元素添加必需属性。
[Required(ErrorMessage="please enter username")] public string UserName { get; set; }
回答by MRB
For client side validation you need jquery and jquery validation.
对于客户端验证，您需要 jquery 和 jquery 验证。
after that client side validation must be enabled in config:
之后必须在配置中启用客户端验证：
<appSettings>
...
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
for server side validation you can check your validation state with:
对于服务器端验证，您可以使用以下方法检查验证状态：
ModelState.IsValid;
回答by Cosmin Cretu
For the record, you can include the following code at the end of your view, to make sure that the [Required]attribute pops up in the user interface:
作为记录，您可以在视图的末尾包含以下代码，以确保[Required]在用户界面中弹出该属性：
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
回答by tomRedox
One other thing to be wary of with [Required]is when using it on an integer field, not just when storing a numeric value, but also, say, when storing the id of the selected value of a dropdown/select list.
要注意的另一件事[Required]是在整数字段上使用它时，不仅在存储数值时，而且在存储下拉/选择列表的选定值的 id 时。
[Required]won't work in that situation because an integer property can never be null and so always has a default value of zero. [Required]is checking that the property has a value, and zero is considered a value, so the check will pass.
[Required]在这种情况下将不起作用，因为整数属性永远不能为空，因此默认值始终为零。 [Required]正在检查该属性是否具有值，零被视为值，因此检查将通过。
In that case either declare the property as a nullableinteger instead:
在这种情况下，要么将该属性声明为可为空的整数：
[Required]
public int? LanguageId { get; set; } // note the int is now nullable
or alternatively use the Rangeattribute to stop zero being an acceptable value:
或者使用该Range属性来停止零是一个可接受的值：
[Range(1, int.MaxValue)]
public int LanguageId { get; set; }
回答by Ike
My fix for my problem was to use this line of code in the model class.
我对我的问题的解决方法是在模型类中使用这行代码。
using System.ComponentModel.DataAnnotations;
be aware that there is another namespace (Microsoft.Build.Framework) that also supports [Required] annotation.
请注意，还有另一个命名空间 (Microsoft.Build.Framework) 也支持 [Required] 注释。
回答by Jehad87
- Steps for solution:
- 解决步骤：
1- Add the scripts to view:
1- 添加脚本以查看：
<script src='@Url.Content("~/Scripts/jquery-1.8.2.js")' type='text/javascript'></script>
<script src='@Url.Content("~/Scripts/jquery.validate.js")' type='text/javascript'>
</script>
<script src='@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")' type='text/javascript'></script>
2- Enable Validation in Web.Config:
2- 在 Web.Config 中启用验证：
<appSettings>
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
3- Add validation html helper in the view:
3- 在视图中添加验证 html 助手：
@Html.ValidationMessageFor(model => model.UserName)
4- Add Required attribute to your model`s element:
4- 将 Required 属性添加到您的模型元素：
[Required(ErrorMessage="please enter username")]
public string UserName { get; set; }
