c# - 无法在 Web API 响应中序列化 ByteArraycontent 类型

Question

我只想返回一个 .csv 文件。

它适用于 HttpResponseMessage 但不适用于 IHttpActionResult

为什么？

有效

public async Task<HttpResponseMessage> ExportLeads()
{
    byte[] bytes = new byte[2];
    var result = new HttpResponseMessage(HttpStatusCode.OK) { Content = new ByteArrayContent(bytes) };
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
    result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "test.csv" };
    return result;
}

不起作用

public async Task<IHttpActionResult> ExportLeads()
{
    byte[] bytes = new byte[2];
    var result = new HttpResponseMessage(HttpStatusCode.OK) { Content = new ByteArrayContent(bytes) };
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
    result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "test.csv" };
    return Content(HttpStatusCode.OK, result);
}

错误 =>

The type "System.Net.Http.ByteArrayContent" can not be serialized.
Annotate it with the Attribut "DataContractAttribute"...

Answer 1

Content(HttpStatusCode.OK, result) 将返回一个 NegotiatedContentResult。因此，您需要设置 ContentNegotiator 和 Formatters 来格式化文件内容。由于您只想将原始 CSV 作为内容中的二进制数组返回(根据您的代码返回 HttpResponseMessage)，那么您应该使用以下内容:

返回 this.ResponseMessage(result)