ASP.NET上传和读取图片文件
一个简单ASP.NET上传读取文件例子
1.前台页面代码：
<body>
<form id="form1" runat="server">
<div style="height:1000px">
<asp:Image ID="Image1" runat="server" />
</div>
<div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">上传</asp:LinkButton>
</div>
</form>
</body>
2.后台页面代码：
protected void Page_Load(object sender, EventArgs e)
{
this.ReadImage();
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(this.FileUpload1.PostedFile.FileName))
{
}
}
//向数据库插入二进制图片
private bool AddImage()
{
//文件完整路径
string fileName = this.FileUpload1.PostedFile.FileName;
//创建文件流
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
//创建byte数字
Byte[] bytes = new Byte[fs.Length];
//写入缓冲区
fs.Read(bytes, 0, Convert.ToInt32(fs.Length));
fs.Close();
//写入数据库
SqlConnection conn = new SqlConnection("Server=(local);User ID=sa;Password=sa;DataBase=Test");
SqlCommand myCommand = new SqlCommand();
myCommand.Connection = conn;
conn.Open();
myCommand.CommandType = CommandType.Text;
myCommand.CommandText = "insert into TestImg values(@img)";
myCommand.Parameters.Add("@img", SqlDbType.Image);//参数类型必须是image类型
myCommand.Parameters[0].Value = bytes;
int count = myCommand.ExecuteNonQuery();
conn.Close();
if (count > 0)
{
return true;
}
else
{
return false;
}
}
//从数据库读取二进制图片
private void ReadImage()
{
DataTable dt = new DataTable();
SqlConnection conn = new SqlConnection("Server=(local);DataBase=Test;User ID=sa;Password=sa");
conn.Open();
SqlDataAdapter sa = new SqlDataAdapter("select * from TestImg",conn);
sa.Fill(dt);
byte[] bytes =(byte[])dt.Rows[0][1];
int len = bytes.Length;
//在服务器上创建对应虚拟路径的物理路径, @"\TempDownLoad"物理文件夹
string url = HttpContext.Current.Server.MapPath(this.Request.ApplicationPath) + @"\TempDownLoad";
//穿件文件流
FileStream fs = new FileStream(url,FileMode.OpenOrCreate);
//以二进制形式写入流
BinaryWriter bw = new BinaryWriter(fs);
//把数据库中的图片二进制添加到BinaryWriter
bw.BaseStream.Write(bytes,0,len);
bw.Flush();
bw.Flush();
fs.Close();
this.Image1.ImageUrl = Context.Request.ApplicationPath + "/TempDownLoad/";
}
3.数据库表代码：
create table TestImg
(
id int identity(1,1),
img image
)
