ASP.NET FileUpLoad上图片操作

首先导入IO命名空间

代码如下

protectedvoid Page_Load(object sender, EventArgs e)
    {

    }
    protectedvoid Button2_Click(object sender, EventArgs e)
    {
        //Response.Write();
        if (this.fileUpload.PostedFile.FileName =="")
        {
            Response.Write("不能上传空文件");
            return;
        }
        try
        {
            String path = Server.MapPath("upload/");//保存上传文件的文件夹upload虚拟路径对应的实际路径
            string pt = path;
            string fn ="";
            if (!Directory.Exists(pt)) //如果文件夹不存在则创建
            {
                Directory.CreateDirectory(pt);
            }

                string filePath =this.fileUpload.PostedFile.FileName;//客户端文件的实际地址
                string serverPath = path + filePath.Substring(filePath.LastIndexOf("\\") +1);//上传的文件保存在服务器端的路径
                string fileName = filePath.Substring(filePath.LastIndexOf("\\") +1);
                System.Text.StringBuilder builder =new System.Text.StringBuilder(filePath);
                builder.Append("<br/>上传文件的类型:"+this.fileUpload.PostedFile.ContentType.ToString() + Environment.NewLine +"");
                builder.Append("<br/>客户端文件地址:"+this.fileUpload.PostedFile.FileName + Environment.NewLine +"");
                builder.Append("<br/>上传文件的文件名:"+ fileName + Environment.NewLine +"");
                builder.Append("<br/>上传文件的扩展名:"+ filePath.Substring(filePath.LastIndexOf(".") +1) + Environment.NewLine +"");
                builder.Append("<br/>上传文件的大小:"+this.fileUpload.PostedFile.ContentLength /1024+"k"+ Environment.NewLine +"");
                if (System.IO.File.Exists(serverPath))//判断服务器上是否有同名文件存在
                {
                    this.lblState.Text ="这个文件在服务器上已经存在,请不要重复上传!";
                    return;
                }
                this.fileUpload.PostedFile.SaveAs(serverPath);//保存文件
                this.lblState.Text = builder.ToString();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);

        }
    }