Asp.Net同时上传多个图片

加上注释 给新手学习参考一下

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class img_upfill : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
//案例信息
string al_name = TextBox1.Text;//需要写入数据库的可以不管
string al_link = TextBox2.Text;;//需要写入数据库的可以不管
string al_sx = TextBox3.Text;;//需要写入数据库的可以不管
int ial_sx = int.Parse(al_sx);;//需要写入数据库的可以不管
string al_class = DropDownList1.SelectedValue;;//需要写入数据库的可以不管
int ial_class = int.Parse(al_class);;//需要写入数据库的可以不管
//logo图片格式检验1
string name1 = FileUpload1.FileName;//设置变量name1等于上传文件的全路径名称也就是浏览后的内容
int size1 = FileUpload1.PostedFile.ContentLength;//获取上传文件的大小
string type1 = FileUpload1.PostedFile.ContentType;//获取上传文件的MIME类型 用语非法格式上传判断
string type2 = name1.Substring(name1.LastIndexOf(".") + 1);//截取出上传文件的类型名称如gif jpg重新命名时使用

if (type1 == "image/pjpeg" && size1 < 112640 && name1 != "" || type1 == "image/gif" && size1 < 112640 && name1 != "")//判断文件的类型和大小 是否为空 如果为JPG或GIF并且不大110KB就算是合法
{
string newName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + "." + type2;//设置一个变量为上传时间的年月日时秒.. 做为上传文件的新名称
string imgpath = Server.MapPath("upfill") + "//" + newName;//Server获取服务器全路径 （包括新文件名）
string sjpath = "upfill//" + newName;//写如数据库的 可以不管
FileUpload1.SaveAs(imgpath);//上传文件
Image1.ImageUrl = sjpath;//图片显示
Label1.Text = "上传成功";//成功提示
}
else
{
if (name1 == "") { Label1.Text = "请选择上传图片"; }
else
{ Label1.Text = "格式不正确或过大"; }//假如没有上传或上传的不符合标准在执行

}

//缩略图格式检验2
string name2 = FileUpload2.FileName;
int size2 = FileUpload2.PostedFile.ContentLength;
string s1type1 = FileUpload2.PostedFile.ContentType;
string s2type2 = name2.Substring(name2.LastIndexOf(".") + 1);

if (s1type1 == "image/pjpeg" && size2 < 112640 && name2 != "" || s1type1 == "image/gif" && size2 < 112640 && name2 != "")
{
string newName2 = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + "a"+"." + s2type2;
string imgpath2 = Server.MapPath("upfill") + "//" + newName2;
string sjpath2 = "upfill//" + newName2;
FileUpload2.SaveAs(imgpath2);
Image2.ImageUrl = sjpath2;
Label2.Text = "上传成功";
}
else
{
if (name2 == "") { Label2.Text = "请选择上传图片"; }
else
{ Label2.Text = "格式不正确或过大"; }
}
//缩略图格式检验3
string name3 = FileUpload3.FileName;
int size3 = FileUpload3.PostedFile.ContentLength;
string s1type3 = FileUpload3.PostedFile.ContentType;
string s2type3 = name3.Substring(name3.LastIndexOf(".") + 1);

if (s1type3 == "image/pjpeg" && size3 < 112640 && name3 != "" || s1type3 == "image/gif" && size3 < 112640 && name3 != "")
{
string newName3 = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() +"b"+ "." + s2type3;
string imgpath3 = Server.MapPath("upfill") + "//" + newName3;
string sjpath3 = "upfill//" + newName3;
FileUpload3.SaveAs(imgpath3);
Image3.ImageUrl = sjpath3;
Label3.Text = "上传成功";
}
else
{
if (name3 == "") { Label3.Text = "请选择上传图片"; }
else
{ Label3.Text = "格式不正确或过大"; }
}

//图格式检验4
string name4 = FileUpload4.FileName;
int size4 = FileUpload4.PostedFile.ContentLength;
string s1type4 = FileUpload4.PostedFile.ContentType;
string s2type4 = name4.Substring(name4.LastIndexOf(".") + 1);

if (s1type4 == "image/pjpeg" && size4 < 112640 && name4 != "" || s1type4 == "image/gif" && size4 < 112640 && name4 != "")
{
string newName4 = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() +"c"+ "." + s2type4;
string imgpath4 = Server.MapPath("upfill") + "//" + newName4;
string sjpath4 = "upfill//" + newName4;
FileUpload4.SaveAs(imgpath4);
Image4.ImageUrl = sjpath4;
Label4.Text = "上传成功";
}
else
{
if (name4 == "") { Label4.Text = "请选择上传图片"; }
else
{ Label4.Text = "格式不正确或过大"; }
}
}
}
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一共上是4张图片一起上传 因为是一样的 注释我就加一段了 中间有一个问题就是 如果重新命名的表达式一样的话 是无法同时写入多个文件的 有好几次都只写了2个，后来才明白是因为名称重复了所以仔细看 newName 的表达式都是不一样的 我加了不同的字母