ASP.NET RC2 IFormFile文件扩展名和文件最大大小自定义验证
ASP.NET RC2 IFormFile文件扩展名和文件最大大小自定义验证
提问于 2016-07-22 22:04:57
我希望在MVC-6 RC2中有自定义的jquery不显眼的验证器。
与 Old Answer类似，我在This one 中看到了一些RC2示例，但我不知道如何在文件中实现它。
这是我的视图模式
public class FileUploadViewModel
{
//TODO [FileType(Validtype="jpeg,png,jif", MaxSize=112222)]// this is what I want
[Required(ErrorMessage = "Please select a file")]
public IFormFile File { get; set; }
[Required(ErrorMessage = "Please select link")]
public string FileName { get; set; }
public string ExternalLink { get; set; }
public string Description { get; set; }
}回答 1
Stack Overflow用户
发布于 2017-06-07 00:01:24
我最终通过使用属性解决了我的问题
下面是我如何创建它的。(我的大小和扩展名都是静态的，在我们的应用程序中也是如此，这就是为什么我在FileTypeAttribute中对其进行了硬编码，但如果您愿意，您可以将其设置为动态，并将其传递给属性构造函数。
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
public class FileTypeAttribute : ValidationAttribute, IClientModelValidator
{
private const int MaxSize = 1048576;
private const string _DefaultErrorMessage = "Only the following file types are allowed: {0}";
private IEnumerable<string> _ValidTypes { get; set; }
public string ValidTypes { get; set; }
public string ErrorMessageExtension { get; set; }
public string ErrorMessageSize { get; set; }
public FileTypeAttribute(string errorExtension, string errorSize)
{
ILang lang = ((ContextServiceImpl)ContextService.Instance).HttpContext.RequestServices.GetService(typeof(ILang)) as ILang;
ErrorMessageExtension = lang[errorExtension];
ErrorMessageSize = lang[errorSize];
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
IFormFile file = value as IFormFile;
if (file != null)
{
if (!_ValidTypes.Any(e => file.FileName.EndsWith(e)))
{
return new ValidationResult(ErrorMessageExtension);
}
if (file.Length > MaxSize)
{
return new ValidationResult(ErrorMessageSize);
}
}
return ValidationResult.Success;
}
public void AddValidation(ClientModelValidationContext context)
{
MergeAttribute(context.Attributes, "data-val", "true");
var errorMessage = FormatErrorMessage(context.ModelMetadata.GetDisplayName());
MergeAttribute(context.Attributes, "data-val-fileextensions", ErrorMessageExtension);
MergeAttribute(context.Attributes, "data-val-maxfilesize", ErrorMessageSize);
}
private bool MergeAttribute(
IDictionary<string, string> attributes, string key, string value)
{
if (attributes.ContainsKey(key))
{
return false;
}
attributes.Add(key, value);
return true;
}
}然后在我的视图模型中，我按如下方式使用属性
public class FileUploadViewModel
{
[FileType("invalid format", "invalid size")]
[Required(ErrorMessage = "Please select a file")]
public IFormFile File { get; set; }
[Required(ErrorMessage = "Please select link")]
public string FileName { get; set; }
public string ExternalLink { get; set; }
public string Description { get; set; }
}然后在javascript中这样做。
$.validator.addMethod("fileextensions",
function (value, element, param) {
var fileType = $(element)[0].files[0].type;
var fileTypes = ["image/jpeg", "image/pjpeg", "image/gif", "image/bmp", "image/png", "image/x-png", "image/tiff"]
var validExtension = $.inArray(type, fileTypes) !== -1;
return validExtension;
});
$.validator.addMethod("maxfilesize",
function (value, element, param) {
var fileSize = $(element)[0].files[0].size;
var maxSize = 1048576;
var validSize = fileSize < maxSize;
return validSize;
});
$.validator.unobtrusive.adapters.add('fileextensions', [], function (options) {
var params = {
fileextensions: $(options.element).data("val-fileextensions").split(',')
};
options.rules['fileextensions'] = params;
options.messages['fileextensions'] = $(options.element).data("val-fileextensions");
});
$.validator.unobtrusive.adapters.add('maxfilesize', [], function (options) {
options.rules['maxfilesize'] = [];
options.messages['maxfilesize'] = $(options.element).data("val-maxfilesize");
});页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/38528483
复制相关文章
相似问题
腾讯云开发者
