jQuery Ajax上传文件

JS代码：

//保存
function btnAdd() {
    var formData = new FormData($("#frm")[0]);

    $.ajax({
        url: "/Admin/ContentManage/SaveEdit",type: "POST"false,必须false才会避开jQuery对 formdata 的默认处理 XMLHttpRequest会对 formdata 进行正确的处理   
        processData: 必须false才会自动加上正确的Content-Type
        success:  (data) {
            if (data == "OK") {
                alert("保存成功");
                $.iDialog("close"); 刷新父页面
            }
            else {
                alert("保存失败：" + data);
            }
        }
    });
}

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ASP.NET MVC后台代码：

首先判断路径是否存在,不存在则创建路径
string path = Path.Combine(System.Configuration.ConfigurationManager.AppSettings["UploadsFiles"],folder + /" + DateTime.Now.ToString(yyyyMMdd") + ");
string physicalPath = server.MapPath(path);
if (!Directory.Exists(physicalPath))
{
    Directory.CreateDirectory(physicalPath);
}

HttpPostedFileBase file = request.Files[0];
string newFileName = Guid.NewGuid().ToString().Replace(-","") + Path.GetExtension(file.FileName);
string savePath = Path.Combine(physicalPath,newFileName);
file.SaveAs(savePath);
fileName = file.FileName;
string url = Path.Combine(path,newFileName);
return url;

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