表單鍵或值長度限制 2048 超出

我正在使用 asp.net 核心來建構 API。我有一個請求，允許使用者使用此程式碼上傳個人資料圖片

[HttpPost("{company_id}/updateLogo")]
       public async Task<IActionResult> updateCompanyLogo(IFormFile imgfile,int company_id)
       {
           string imageName;
           // upload file
           if (imgfile == null || imgfile.Length == 0)
               imageName = "default-logo.jpg";
           else
           {
               imageName = Guid.NewGuid() + imgfile.FileName;
               var path = _hostingEnvironment.WebRootPath + $@"\Imgs\{imageName}";
               if (imgfile.ContentType.ToLower().Contains("image"))
               {
                   using (var fileStream = new FileStream(path, FileMode.Create))
                   {
                       await imgfile.CopyToAsync(fileStream);
                   }
               }
           }
.
.

但它一直返回此異常：Form key or value length limit 2048 exceeded

請求

http://i.imgur.com/25B0qkD.png

更新：

我已經嘗試過這段程式碼，但它不起作用

   services.Configure<FormOptions>(options =>
   {
       options.ValueLengthLimit = int.MaxValue; //not recommended value
       options.MultipartBodyLengthLimit = long.MaxValue; //not recommended value
   });

預設情況下，ASP.NET Core 強制執行 2048 內部的鍵/值長度限制FormReader為常量，並應用FormOptions如下所示：

public class FormReader : IDisposable
{
   public const int DefaultValueCountLimit = 1024;
   public const int DefaultKeyLengthLimit = 1024 * 2; // 2048
   public const int DefaultValueLengthLimit = 1024 * 1024 * 4; // 4194304
   // other stuff
}

public class FormOptions
{
   // other stuff
   public int ValueCountLimit { get; set; } = DefaultValueCountLimit;
   public int KeyLengthLimit { get; set; } = FormReader.DefaultKeyLengthLimit;
   public int ValueLengthLimit { get; set; } = DefaultValueLengthLimit;
   // other stuff
}

KeyValueLimit因此，您可以創建一個自定義屬性，通過使用和ValueCountLimit屬性（ValueLengthLimit等等）來明確設置您自己的鍵/值長度限制：

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class RequestSizeLimitAttribute : Attribute, IAuthorizationFilter, IOrderedFilter
{
   private readonly FormOptions _formOptions;

   public RequestSizeLimitAttribute(int valueCountLimit)
   {
       _formOptions = new FormOptions()
       {
           // tip: you can use different arguments to set each properties instead of single argument
           KeyLengthLimit = valueCountLimit,
           ValueCountLimit = valueCountLimit,
           ValueLengthLimit = valueCountLimit

           // uncomment this line below if you want to set multipart body limit too
           // MultipartBodyLengthLimit = valueCountLimit
       };
   }

   public int Order { get; set; }

   // taken from /a/38396065
   public void OnAuthorization(AuthorizationFilterContext context)
   {
       var contextFeatures = context.HttpContext.Features;
       var formFeature = contextFeatures.Get<IFormFeature>();

       if (formFeature == null || formFeature.Form == null)
       {
           // Setting length limit when the form request is not yet being read
           contextFeatures.Set<IFormFeature>(new FormFeature(context.HttpContext.Request, _formOptions));
       }
   }
}

動作方法中的使用範例：

[HttpPost("{company_id}/updateLogo")]
[RequestSizeLimit(valueCountLimit: 2147483648)] // e.g. 2 GB request limit
public async Task<IActionResult> updateCompanyLogo(IFormFile imgfile, int company_id)
{
   // contents removed for brevity
}

**注意：**如果使用的是最新版本的 ASP.NET Core，請將名為的屬性更改ValueCountLimit為KeyCountLimit.

**更新：**屬性Order必須包含在屬性類中，因為它是已實現介面的成員IOrderedFilter。

類似問題：

表單送出導致“InvalidDataException：超出表單值計數限制 1024”。

Request.Form 拋出異常

引用自：https://stackoverflow.com/questions/43305220