Question

我正在使用MVC 5网络Api控制器，我想返回一个文件：

[Route("")]
public HttpResponseMessage GetFile()
{
    var statusCode = HttpStatusCode.OK;
    FileStream file = XLGeneration.XLGeneration.getXLFileExigence();

    return Request.CreateResponse(statusCode, file);
}

它不起作用。

邮递员的例外是：

“ExceptionMessage”：“'ObjectContent`1'类型无法序列化内容类型'application / json; charset = utf-8'的响应正文。”

Answer 1

我发布了对我有用的东西，以防其他人遇到麻烦。

[ActionName("File")]
[HttpGet]
public HttpResponseMessage File()
{
        var response = new HttpResponseMessage(HttpStatusCode.OK);
        var stream = new System.IO.FileStream(yourFilePath, System.IO.FileMode.Open);
        response.Content = new StreamContent(stream);
        response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");

        return response;
}

Answer 2

我从WebAPI控制器返回了byte []并成功下载了PDF。我正在使用iTextSharp（LGPL）4.1.6免费PDF转换器。要安装iTextSharp（LGPL / MPL），请在程序包管理器控制台中运行以下命令。

安装包装iTextSharp-LGPL -Version 4.1.6

服务器端代码

    [Route("Export/ExportToPdf")]

    public byte[] ExportToPdf(string html)
    {           

        MemoryStream msOutput = new MemoryStream();
        TextReader reader = new StringReader(html);
        Document document = new Document(new Rectangle(842, 595));             
        PdfWriter writer = PdfWriter.GetInstance(document, msOutput);
        document.Open();
        document.HtmlStyleClass = @"<style>*{ font-size: 8pt; font-family:arial;}</style>";

        var parsedHtmlElements = HTMLWorker.ParseToList(new StringReader(html), null);
        foreach (var htmlElement in parsedHtmlElements)
        {
            document.Add(htmlElement as IElement);
        }

        document.Close();

        return msOutput.ToArray();
    }

客户端代码。

//Call this function inside of AJAX success.
function ExportToPDF(data) {

    //base64 To ArrayBuffer
    var binaryString = window.atob(data);
    var binaryLen = binaryString.length;
    var bytes = new Uint8Array(binaryLen);
    for (var i = 0; i < binaryLen; i++) {
        var ascii = binaryString.charCodeAt(i);
        bytes[i] = ascii;
    }
    //-------

    var link = document.createElement('a');
    link.href = window.URL.createObjectURL(new Blob([bytes], { type: 'application/pdf' }));
    link.download = "Report.pdf";
    link.click();   
}

Answer 3

试试这个......

{{1}}

这实际上应该将其作为文件传回。

Answer 4

只是想法：

public HttpResponseMessage GetFile()
{
    FileStream file = XLGeneration.XLGeneration.getXLFileExigence();

    using(var sr = new StreamReader(file))
    {
        content = sr.ReadToEnd();

        return new HttpResponseMessage
        {
            Content = new StringContent(content, Encoding.UTF8, "application/json")
        };
    }
}

如何从web api控制器返回文件？

4 个答案: