Question

我把下载链接放在jqgrid中，我的文件存储在服务器而不是数据库中，文件是不同类型的（扩展名）我希望用户在点击下载链接时应该下载文件

加载代码jqgrid如Follws

public object GetJSONFormatProjectDetails(List<ProjectMasterDTO> listProjectDTO, int SkipCount)
    {
        var data = (listProjectDTO.Select(c => new
        {
            id = c.ProjectID,
            cell = new[]
                        {
                            c.ProjectName,
                            c.OfficeName,
                            c.ProjectType,
                            c.ProjectNature,
                            c.EntrepreneurName,
                            c.Year + " Years " +c.Month  + " Months " + c.Day + " Days" ,
                            c.ConcessionWEFdate,
                            c.ProjectStartDate,
                            c.ProjectEndDate,
                            c.isRoadApplicable,
                            (c.FilePath != "NA" ) ? "<a href='#' style='color:green' onclick='DownLoadFile(\""+URLEncrypt.EncryptParameters(new string[]{ "filepath =" +c.FilePath.Replace("/","$").Replace(" ","#").Trim()})+"\");return false;'>"+(c.FilePath != "NA" ? "DownLoad":"Not Available") + " </a>" : "<span style='color:Red' >Not Available</span>"

                        }
        })).ToArray().Skip(SkipCount);
        return data;
    }

JS文件代码如下

function DownLoadFile(param) {
$.ajax({
url: "/Home/GetFile?parameter=" + param,
    cache: false,
    type: "POST",
    async: false
});

}

控制器中的

代码如下

  public ActionResult GetFile(string parameter)
    {
        string queryStringParameters = Request.QueryString["parameter"];

        if (queryStringParameters == null)
        {
            throw new Exception("Url is tampered");
        }

        string[] parameterArray = queryStringParameters.Split('/');

        string param = null;
        string hash = null;
        string key = null;
        if (parameterArray.Length == 3)
        {
            param = parameterArray[0];
            hash = parameterArray[1];
            key = parameterArray[2];
        }
        if (!(string.IsNullOrEmpty(parameter)))
        {
            Dictionary<string, string> parameters = URLEncrypt.DecryptParameters(new string[] { param, hash, key });
            string FilePath =string.Empty ;
            parameters.TryGetValue("filepath", out FilePath);
            FilePath = FilePath.Replace('$','\\');

            // DownloadFile(FilePath);

            string name = Path.GetFileName(FilePath);
            string ext = Path.GetExtension(FilePath);
            string type = "";
            // set known types based on file extension  
            if (ext != null)
            {
                switch (ext.ToLower())
                {

                    case ".pdf":
                        type = "Application/pdf";
                        break;

                    case ".doc":

                    case ".docx":
                        type = "Application/msword";
                        break;

                    case ".jpg":

                    case ".bmp":

                    case ".tiff":

                    case ".png":

                    case ".gif":

                    case ".jpeg":
                        type = "Application/Image";
                        break;
                    default:
                        type = "Application";
                        break;

                }
            }
            Response.AppendHeader("content-disposition", "attachment; filename=" + name);

            if (type != "")
            {
                Response.ContentType = type;
            }
            String FullFilePath = @"F:\MHTOLL\ContractUploadDetails\" + name;
            //return File(new FileStream(path + fileName, FileMode.Open), "text/plain", fileName);
          //  return File(new FileStream(FullFilePath, FileMode.Open), type, name);
            return File(FullFilePath, type,name);

        }
        return null;
    }

现在不要介意返回null和异常处理

还建议显示用于下载文件的.gif动画。

Answer 1

我认为您不能使用AJAX调用来下载文件。

我认为这个答案会让你得到你想要的。请务必阅读有关下载提示和MIME类型的注释。 Download File Using Javascript/jQuery

Answer 2

我最近遇到了同样的问题，并意识到AJAX无法下载文件。请尝试使用ActionLink：

@Html.ActionLink("ButtonName", "controllerFunctionName", "controllerName", new { functionParamName = paramValue })

您可以在控制器中包含您的功能：

public ActionResult controllerFunctionName(type functionParamName){ // do your download here }

在ASP mvc .net中下载文件

2 个答案: