upload Upload a single picture
- 2021-07-01 07:13:25
- OfStack
Upload a single picture through Upload. Please see the code for the specific implementation.
protected void btnpic_upload_Click(object sender, EventArgs e)
{
#region 上传文件
Boolean fileOk = false;
if (pic_upload.HasFile)//验证是否包含文件
{
//取得文件的扩展名,并转换成小写
string fileExtension = Path.GetExtension(pic_upload.FileName).ToLower();
//验证上传文件是否图片格式
fileOk = IsImage(fileExtension);
if (fileOk)
{
//对上传文件的大小进行检测,限定文件最大不超过8M
if (pic_upload.PostedFile.ContentLength < 8192000)
{
string filepath = "~/Admin/I_Institution/Images/";
if (Directory.Exists(Server.MapPath(filepath)) == false)//如果不存在就创建file文件夹
{
Directory.CreateDirectory(Server.MapPath(filepath));
}
string virpath = filepath + CreatePasswordHash(pic_upload.FileName, 4) + fileExtension;//这是存到服务器上的虚拟路径
string mappath = Server.MapPath(virpath);//转换成服务器上的物理路径
pic.Visible = true;
pic_upload.PostedFile.SaveAs(mappath);//保存图片
//显示图片
pic.ImageUrl = virpath;
lbl_pic.Visible = true;
//清空提示
lbl_pic.Text = "上传成功";
}
else
{
pic.Visible = false;
lbl_pic.Visible = true;
pic.ImageUrl = "";
lbl_pic.Text = "文件大小超出8M!请重新选择!";
}
}
else
{
lbl_pic.Visible = false;
pic.ImageUrl = "";
lbl_pic.Text = "要上传的文件类型不对!请重新选择!";
}
}
else
{
lbl_pic.Visible = false;
pic.ImageUrl = "";
lbl_pic.Text = "请选择要上传的图片!";
}
#endregion
}
/// <summary>
/// 验证是否指定的图片格式
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public bool IsImage(string str)
{
bool isimage = false;
string thestr = str.ToLower();
//限定只能上传jpg和gif图片
string[] allowExtension = { ".jpg", ".gif", ".bmp", ".png" };
//对上传的文件的类型进行1个个匹对
for (int i = 0; i < allowExtension.Length; i++)
{
if (thestr == allowExtension[i])
{
isimage = true;
break;
}
}
return isimage;
}
/// <summary>
/// 创建1个指定长度的随机salt值
/// </summary>
public string CreateSalt(int saltLenght)
{
//生成1个加密的随机数
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] buff = new byte[saltLenght];
rng.GetBytes(buff);
//返回1个Base64随机数的字符串
return Convert.ToBase64String(buff);
}
/// <summary>
/// 返回加密后的字符串
/// </summary>
public string CreatePasswordHash(string pwd, int saltLenght)
{
string strSalt = CreateSalt(saltLenght);
//把密码和Salt连起来
string saltAndPwd = String.Concat(pwd, strSalt);
//对密码进行哈希
string hashenPwd = FormsAuthentication.HashPasswordForStoringInConfigFile(saltAndPwd, "sha1");
//转为小写字符并截取前16个字符串
hashenPwd = hashenPwd.ToLower().Substring(0, 16);
//返回哈希后的值
return hashenPwd;
}
Get the uploaded picture path:
string IconUrl = this.pic.ImageUrl.Trim();
model.IconUrl = Path.GetFileName(IconUrl); // Get the URL of the uploaded picture control
Foreground code:
tr>
<td height="25" width="30%" align="right">
Mechanism icon path :
</td>
<td height="25" width="*" align="left">
<asp:Image ID="pic" runat="server" Width="200px" Visible="False" /><br />
<asp:FileUpload ID="pic_upload" runat="server" />
<asp:Button ID="btnpic_upload" runat="server" Text=" Pictures start uploading " OnClick="btnpic_upload_Click" /><br />
<asp:Label ID="lbl_pic" runat="server" Text="" Visible="False"></asp:Label>
</td>
</tr>
The above code is the whole code of upload uploading a single picture. I hope you like it.