C# MVC中的自定义验证未在局部视图上执行

因此，我有文件上传输入，它是强类型的，下面是

模型类

public class UploadImageAlbum
{
    [CustomFileValidator]
    public HttpPostedFileBase Images { get; set; }
}

我的

CustomFileValidator

类如下：

[AttributeUsage(AttributeTargets.Property,AllowMultiple =true,Inherited =false)]
public class CustomFileValidator : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext context)
    {
        const int maxContent = 1024 * 1024 * 50;//50 MB
        var sAllowedExt = new string[] { ".jpg", ".png" };
        var file = value as HttpPostedFileBase;
        //Check for null
        if (file == null)
        {
            return new ValidationResult("Please select an image to upload");
        }

        //Check for File Extension
        if (sAllowedExt.ToList().Contains(file.FileName.Substring(file.FileName.LastIndexOf('.'))))
        {
            return new ValidationResult("Please Upload a valid file of type : " + string.Join(",", sAllowedExt));
        }

        //Check for length of file
        if(file.ContentLength>maxContent)
        {
            return new ValidationResult("File is too large, maximum allowed size is :" + (maxContent / 1024) + "MB");
        }
        return ValidationResult.Success;
    }
}

@using (Html.BeginForm("UploadImages", "Admin", FormMethod.Post, htmlAttributes: new { id = "frmUploadImages", novalidate = "novalidate", autocomplete = "off", enctype = "multipart/form-data" }))
{
      <div class="form-group">
            <span class="btn btn-default btn-file-img">
                  Browse @Html.TextBoxFor(m => m.UIAModel.Images, new { type = "file", multiple = "multiple", data_charset = "file" })
            </span>&nbsp;
            <span class="text-muted" id="filePlaceHolder">No files selected</span>
            @Html.ValidationMessageFor(m=>m.UIAModel.Images, null, htmlAttributes: new { @class = "invalid" })
      </div>
      <div class="form-group">
         <button class="btn btn-primary addImage pull-right">
             <i class="fa fa-upload"></i> Upload
         </button>
      </div>
}

我的

partialview

如下：

[AttributeUsage(AttributeTargets.Property,AllowMultiple =true,Inherited =false)]
public class CustomFileValidator : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext context)
    {
        const int maxContent = 1024 * 1024 * 50;//50 MB
        var sAllowedExt = new string[] { ".jpg", ".png" };
        var file = value as HttpPostedFileBase;
        //Check for null
        if (file == null)
        {
            return new ValidationResult("Please select an image to upload");
        }

        //Check for File Extension
        if (sAllowedExt.ToList().Contains(file.FileName.Substring(file.FileName.LastIndexOf('.'))))
        {
            return new ValidationResult("Please Upload a valid file of type : " + string.Join(",", sAllowedExt));
        }

        //Check for length of file
        if(file.ContentLength>maxContent)
        {
            return new ValidationResult("File is too large, maximum allowed size is :" + (maxContent / 1024) + "MB");
        }
        return ValidationResult.Success;
    }
}

@using (Html.BeginForm("UploadImages", "Admin", FormMethod.Post, htmlAttributes: new { id = "frmUploadImages", novalidate = "novalidate", autocomplete = "off", enctype = "multipart/form-data" }))
{
      <div class="form-group">
            <span class="btn btn-default btn-file-img">
                  Browse @Html.TextBoxFor(m => m.UIAModel.Images, new { type = "file", multiple = "multiple", data_charset = "file" })
            </span>&nbsp;
            <span class="text-muted" id="filePlaceHolder">No files selected</span>
            @Html.ValidationMessageFor(m=>m.UIAModel.Images, null, htmlAttributes: new { @class = "invalid" })
      </div>
      <div class="form-group">
         <button class="btn btn-primary addImage pull-right">
             <i class="fa fa-upload"></i> Upload
         </button>
      </div>
}

---

但是，即使完成了所有步骤，它也不会显示任何消息，值得注意的是，如果我为相同的内容添加

[Required]

属性，它会工作得很好，但自定义验证我从未显示过任何消息。要使这个

CustomValidator

正常工作，我还需要添加什么？我跟着，但还是帮不了什么忙。另外，如果有人告诉我如何更新此

模型

，以便接受多个图像，这将非常有帮助。

为了获得客户端验证，您的属性必须

实现将添加关联的

data val-*

属性，以及

您必须包含向jQuery验证程序添加方法的脚本

是创建自定义客户端和服务器端验证属性的良好指南

还要注意的是，您当前的属性相当有限，因为文件类型和大小是固定的，如果包含属性来指定文件类型和最大文件大小，那么您可以将其用作（例如）

提供一个属性示例，该属性验证文件类型，但可以修改为包含

MaxSize

属性

旁注：如果您正在加载动态内容，则应首先将验证器设置为

null

var form = $('form#frmUploadImages');
form.data('validator', null);
$.validator.unobtrusive.parse(form);

---

否决票？？是否至少删除一条评论…：/是否需要客户端验证？您的属性未实现客户端验证所需的

iclientvalidable

。您还需要一个脚本来向jquery.validate添加方法/规则。请参阅StephenMuecke的指南。。它就在我上面链接的帖子里，但没有太多解释。。谢谢你……）如果您将其作为答案发布，并进行一些修改或解释，那么我将接受它：）这是如此方便，现在我明白了这种形式的验证。感谢您简单而简洁的解释：）