1.前端html代码

<input style="width:100%" onchange="loadpicture(1)" type="file" name="file" id="file➩1">

<img id="pic➩1" style="width:100%;height:120px" src="/Resource/Document/NetworkDisk/ProjectActivity/590600b4-f330-43c2-96fb-ea221f9e0ce2.jpg">

<input hidden="true" id="picsrc➩1" class="txt">

<input hidden="true" id="PictureUrl➩1" class="txt">

2.js代码,使用FileReader读取文件

 function loadpicture(i) {
var obj = document.getElementById("file➩" + i);
var file = obj.files[0];
//alert(file);
//创建读取文件的对象
var reader = new FileReader(); //创建文件读取相关的变量
var imgFile; //为文件读取成功设置事件
reader.onload = function (e) {
//alert('文件读取完成');
imgFile = e.target.result;
//console.log(imgFile);
$("#pic➩" + i).attr('src', imgFile);
$("#picsrc➩" + i).val(imgFile);
}; //正式读取文件
reader.readAsDataURL(file); }

3.ajax传后台,此处有封装,用GetTableDataJson的方式获取了每一个file的ID

实际传输的话只需要传

 $("#picsrc➩" + i).val()的值
//保存事件
function AcceptClick() {
if (!CheckDataValid('#form1')) {
return false;
} var ActivityForm = GetTableDataJson("#ActivityForm");
var ProblemForm = GetTableDataJson("#ProblemForm");
Loading(true, "正在提交数据...");
window.setTimeout(function () {
var postData = GetWebControls("#form1"); postData["ActivityForm"] = ActivityForm;
postData["ProblemForm"] = ProblemForm;
postData["BuildFormJson"] = JSON.stringify(GetWebControls("#CustomAttribute"));
AjaxJson("/ProjectManageModule/project/SubmitActivityForm?KeyValue=" + GetQuery('KeyValue'), postData, function (data) {
tipDialog(data.Message, 3, data.Code);
top.frames[tabiframeId()].windowload();
closeDialog();
});
}, 200);
}

4.后台c#代码,有可能会报GDI一般性错误的报错,

我这里是一开始目录没有对,所以报错,

realPath可以用
this.Server.MapPath(VirtualPath)的方式获取
由于我这边的文件存储目录和应用目录不在同一个盘符,所以使用了直接路径的写法
#region 图片处理,采用base64的方式转码解码
string virtualPath = "";
//图片上传
if (!string.IsNullOrEmpty(entityD.picsrc))
{
//删除老的图片
string FilePath = this.Server.MapPath(entityD.PictureUrl);
if (System.IO.File.Exists(FilePath))
System.IO.File.Delete(FilePath); string fileGuid = CommonHelper.GetGuid;
//long filesize = Filedata.ContentLength;
string FileEextension = ".jpg";
string uploadDate = DateTime.Now.ToString("yyyyMMdd");
//string UserId = ManageProvider.Provider.Current().UserId;
virtualPath = string.Format("~/Resource/Document/NetworkDisk/{0}/{1}{2}", "ProjectActivity", fileGuid, FileEextension); string realPath = string.Format(@"D:\LeaRun\Resource\Document\NetworkDisk\{0}\{1}{2}", "ProjectActivity", fileGuid, FileEextension); //string fullFileName = this.Server.MapPath(virtualPath);
////创建文件夹,保存文件
//realPath = Path.GetDirectoryName(fullFileName);
//先处理图片文件
string temp = entityD.picsrc.Substring();
byte[] arr2 = Convert.FromBase64String(entityD.picsrc.Substring());
using (MemoryStream ms2 = new MemoryStream(arr2))
{
System.Drawing.Bitmap bmp2 = new System.Drawing.Bitmap(ms2);
bmp2.Save(realPath, System.Drawing.Imaging.ImageFormat.Jpeg);
bmp2.Dispose();
ms2.Close();
}
entityD.PictureUrl = virtualPath;
}
#endregion
05-11 14:59