将文件对象从Javascript传递到Web API

Passing file object to Web API from Javascript

本文关键字：Web API Javascript 文件 对象      更新时间：2023-09-26

我正试图通过Javscript web api调用的web api将文件从本地机器上传到sharepoint。试图将文件对象从javascript传递到web api，但我一直收到错误，如类型错误、找不到资源等。有人能帮我吗。

Javascript代码：

 $scope.Upload = function () {
        if (!window.FileReader) {
            alert("This browser does not support the HTML5 File APIs");
            return;
        }
        var element = document.getElementById("uploadInput");
        var file = element.files[0];
        //var folderStructure = "/PublishingImages/Lists/Featured%20Stories/";
        var parts = element.value.split("''");
        var fileName = parts[parts.length - 1];
        filename1 = fileName;
        var descriptionName = fileName;
        var reader = new FileReader();
        var indentifier = '';
        //url = encodeURI(url);
        reader.onload = function (e) {
            UploadDocs(e.target.result, fileName);
        }
        reader.onerror = function (e) {
            alert(e.target.error);
        }
        reader.readAsArrayBuffer(file);
    }
    function UploadDocs(str, file) {
        var url = webApiUrl + "api/Registration/UploadFileToDocmentLibrary";
        $.ajax({
            type: "POST",
            url: url,
            contentType: 'application/json; charset=utf-8',
            data: JSON.stringify(str),
            dataType: 'json',
            async: false,
            success: function (response) {
                console.log(response.fileData);
                console.log('Success');
            },
            error: function (data) {
                console.log('fail');
            }
        });
    }


Web API代码：

[HttpPost] // This is from System.Web.Http, and not from System.Web.Mvc
    public void UploadFileToDocmentLibrary(HttpPostedFile uploadFile)
    {
//code to upload to sharepoint
}

您可以使用FormData 上传整个文件

JS:

$scope.uploadDocs = function () {
    var element = document.getElementById("uploadInput");
    var file = element.files[0];
    var loFormData = new FormData();
    loFormData.append("filename", file.name);
    loFormData.append("file", file);
    var loAjaxRequest = $.ajax({
        cache: false,
        type: 'POST',
        url: webApiUrl + "api/Registration/UploadFileToDocmentLibrary",
        contentType: false,
        processData: false,
        data: loFormData
    });
    loAjaxRequest.done(function (xhr, textStatus) {
        alert(textStatus);
    });
};

Web Api:

[HttpPost]
public async Task<HttpResponseMessage> UploadFileToDocmentLibrary()
{
    if (!this.Request.Content.IsMimeMultipartContent())
        throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
    try
    {
        var loProvider = new MultipartFormDataStreamProvider(Path.GetTempPath());
        await Request.Content.ReadAsMultipartAsync(loProvider);
        string lsFilename = loProvider.FormData.GetValues("filename").First();
        var loFile = loProvider.FileData.First();
        string lsFileContent = File.ReadAllText(loFile.LocalFileName);             
        return new HttpResponseMessage(HttpStatusCode.OK);
    }
    catch (Exception exp)
    {
        return this.Request.CreateErrorResponse(HttpStatusCode.InternalServerError, exp);
    }
}
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