Question

我正在尝试使用C＃中的Angular 7和Web API下载.xlsx文件但我收到此错误：

我的service.ts

public exportExcelFile(matchedRows: string, reportInfoId: number): Observable<any> {
        const httpOptions = {
            headers: new HttpHeaders({ 'responseType':  'ResponseContentType.Blob',
            'Content-Type':  'application/vnd.ms-excel'})};
        const url = `${environment.apiUrl}report/${reportInfoId}/exportExcelFile?matchedRows=${matchedRows}`;

        return this.http.get(url, httpOptions);

    }

“消耗”我的服务的方法：

exportExcelFile(matchedRows:string){
        this.service.exportExcelFile(matchedRows, this.reportInfo.ide).subscribe((response)=>{
            console.log(response)
        })  
        this.exportingExcelFile=false;
        this.ready=true;
    }

从API检索我的响应的方法

[HttpGet]
public IHttpActionResult ExportExcelFile(int reportId, bool matchedRows)
{

    var user = Request.GetAuthenticatedUser();
    var query = new GetExcelFileQuery(reportId, user.UserName, matchedRows);
    var result = _dispatcher.Dispatch<GetExcelFileQuery, GetExcelFileModel>(query);

    using (var memoryStream = new MemoryStream()) //creating memoryStream
    {
        result.Workbook.Write(memoryStream);

        var response = new HttpResponseMessage(HttpStatusCode.OK);
        response.Content = new ByteArrayContent(memoryStream.ToArray());
        response.Content.Headers.ContentType = new MediaTypeHeaderValue
               ("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        response.Content.Headers.ContentDisposition =
               new ContentDispositionHeaderValue("attachment")
               {
                   FileName = result.FileName
               };

        return result == null ? NotFound() : (IHttpActionResult)new FileResult(response);
    }
}

如果我直接使用浏览器上的URL访问，则excel文件已正确导出

Answer 1

您的后端很好。客户端试图解析响应，因为它是一个json文件。 'responseType'应该只是'blob'，并且应该将其放置在HttpHeaders对象的外部。您可以根据情况忽略整个httpHeaders对象

const url = `${environment.apiUrl}report/${reportInfoId}/exportExcelFile?matchedRows=${matchedRows}`;

return this.http.get(url, {responseType: 'blob'});

有关responseType对象的一些其他信息： https://angular.io/api/common/http/HttpRequest#responseType

Answer 2

Service.ts

   public exportExcelFile(matchedRows: string, reportInfoId: number): Observable<any> {

        const url = `${environment.apiUrl}report/${reportInfoId}/exportExcelFile?matchedRows=${matchedRows}`;

        return this.http.get(url,{  observe: 'response', responseType: 'blob'} );

    }

调用我的服务的方法

exportExcelFile(matchedRows:string){
        this.service.exportExcelFile(matchedRows, this.reportInfo.ide).subscribe((response)=>{

            const blob = new Blob([response.body],
                { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });

            const file = new File([blob], 'reports.txt',
                { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });


            saveAs(file);
        })

使用

import { saveAs } from 'file-saver';

Excel文件正确生成

在ASP.NET Web API中使用http.get in angular下载.xlsx文件时出错

2 个答案: