如何解决C#字节数组到Javascript Blob创建并自动下载PDF文件
我在C#中具有Web api,该API返回PDF文件的字节数组。这是C#代码
[HttpGet]
[Route("Download")]
public async Task<ActionResult<byte[]>> DownloadFiles(int fileDocumentId)
{
var file = await _fileService.FetchFiles(fileDocumentId);
return file.ArchiveData;
}
function download(id) {
fetch(`https://localhost:xxx/api/file/download?fileDocumentId=11`)
.then(response => {
debugger
return response.json()
})
.then(result => {
debugger
console.log('Success:',result);
var file = new Blob([result],{ type: 'application/pdf' });
var fileURL = URL.createObjectURL(file);
window.open(fileURL);
})
.catch(function (error) {
console.log('Request Failed',error)
});
}
在console.log('Success:',result);
中,控制台中的输出如下所示:
Success: 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
更多搜索之后,我还尝试了以下代码,该代码在创建blob之前将字节数组转换为arrayBuffer。它确实创建并下载了PDF,但是当我打开PDF时,该PDF也已损坏。
function downloadpdf(pdfUrl) {
debugger
fetch(pdfUrl).then(resp => resp.arrayBuffer()).then(resp => {
const file = new Blob([resp],{ type: 'application/pdf' });
const fileURL = URL.createObjectURL(file);
const link = document.createElement('a');
link.href = fileURL;
link.download = "FileName" + new Date() + ".pdf";
link.click();
});
}
downloadpdf('https://localhost:xxx/api/file/download?fileDocumentId=11')
对于FetchFiles
方法,基本上是读取PDF文件并将其转换为字节数组。
byte[] fileBytes = await File.ReadAllBytesAsync(file);
解决方法
您的代码将字节数组返回到JavaScript,而您不需要这样做,只需将其返回为FileContentResult
即可,它将向响应中写入一个二进制文件,并且浏览器会将其下载为文件,即使您直接在浏览器中调用API。
[HttpGet]
[Route("Download")]
public async Task<ActionResult> DownloadFiles(int fileDocumentId)
{
string filePath = fileDocumentId=11;
var file = await _fileService.FetchFiles(fileDocumentId);
string fileName = "FileName" + DateTime.Now.ToString() + ".pdf";
return File(file.ArchiveData,"application/force-download",fileName);
}
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