GridView控件显示图片

与图片的二进制数据库存储和显示

1.将图片以二进制存入数据库

2.读取二进制图片在页面显示

3.设置Image控件显示从数据库中读出的二进制图片

4.GridView中ImageField以URL方式显示图片

5.GridView显示读出的二进制图片

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1.将图片以二进制存入数据库

//保存图片到数据库
 
protected void Button1_Click(object sender, EventArgs e)
 
{
 
    //图片路径
 
    string strPath = "~/photo/03.JPG";
 
    string strPhotoPath = Server.MapPath(strPath);
 
    //读取图片
 
    FileStream fs = new System.IO.FileStream(strPhotoPath, FileMode.Open, FileAccess.Read);
 
    BinaryReader br = new BinaryReader(fs);
 
    byte[] photo = br.ReadBytes((int)fs.Length);
 
    br.Close();
 
    fs.Close();
 
    //存入
 
    SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
 
    string strComm = " INSERT INTO personPhoto(personName, personPhotoPath, personPhoto) ";
 
    strComm += " VALUES('wangwu', '" + strPath + "', @photoBinary )";
 
    SqlCommand myComm = new SqlCommand(strComm, myConn);
 
    myComm.Parameters.Add("@photoBinary", SqlDbType.Binary,photo.Length);
 
    myComm.Parameters["@photoBinary"].Value = photo;
 
    myConn.Open();
 
    myComm.ExecuteNonQuery();
 
    myConn.Close();
 
}
 

2.读取二进制图片在页面显示

//读取图片
 
SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
 
string strComm = " SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ";
 
SqlCommand myComm = new SqlCommand(strComm, myConn);
 
myConn.Open();
 
SqlDataReader dr = myComm.ExecuteReader();
 
while (dr.Read())
 
{
 
    byte[] photo = (byte[])dr["personPhoto"];
 
    this.Response.BinaryWrite(photo);
 
}
 
dr.Close();
 
myConn.Close();
 
//或
/////////////////////////////////////////// 
SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
 
SqlDataAdapter myda = new SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn);
 
DataSet myds = new DataSet();
 
myConn.Open();
 
myda.Fill(myds);
 
myConn.Close();
 
byte[] photo = (byte[])myds.Tables[0].Rows[0]["personPhoto"];
 
this.Response.BinaryWrite(photo);
 
  
 
  
 

3.设置Image控件显示从数据库中读出的二进制图片

SqlConnection myConn = new SqlConnection("Data Source=192.168.0.36;Initial Catalog=TestDB;User ID=sa;Password=sa");
 
SqlDataAdapter myda = new SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn);
 
DataSet myds = new DataSet();
 
myConn.Open();
 
myda.Fill(myds);
 
myConn.Close();
 
byte[] photo = (byte[])myds.Tables[0].Rows[0]["personPhoto"];
 
//图片路径
 
string strPath = "~/photo/wangwu.JPG";
 
string strPhotoPath = Server.MapPath(strPath);
 
//保存图片文件
 
BinaryWriter bw = new BinaryWriter(File.Open(strPhotoPath,FileMode.OpenOrCreate));
 
bw.Write(photo);
 
bw.Close();
 
//显示图片
 
this.Image1.ImageUrl = strPath;
 

4.GridView中ImageField以URL方式显示图片

 
----------------------------
 
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
 
    <Columns>
 
        <asp:BoundField DataField="personName" HeaderText="姓名" />
 
        <asp:ImageField DataImageUrlField="personPhotoPath"
 
            HeaderText="图片">
 
        </asp:ImageField>
 
    </Columns>
 
</asp:GridView>
 
//后台直接绑定即可
 
  
 

5.GridView显示读出的二进制图片

 
//样板列
 
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
 
    <Columns>
 
        <asp:BoundField DataField="personName" HeaderText="姓名" />
 
        <asp:ImageField DataImageUrlField="personPhotoPath"
 
            HeaderText="图片">
 
        </asp:ImageField>
 
        <asp:TemplateField HeaderText="图片">
 
            <ItemTemplate>
 
                <asp:Image ID="Image1" runat="server" />
 
            </ItemTemplate>
 
        </asp:TemplateField>
 
    </Columns>
 
</asp:GridView>
 
  
 
  
 
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
 
{
 
    if (e.Row.RowIndex < 0)
 
        return;
 
    // System.ComponentModel.Container
 
    string strPersonName = (string)DataBinder.Eval(e.Row.DataItem, "personName");
 
    Image tmp_Image = (Image)e.Row.Cells[2].FindControl("Image1");
 
    if (!System.Convert.IsDBNull(DataBinder.Eval(e.Row.DataItem, "personPhoto")))
 
    {
 
        //
 
        byte[] photo = (byte[])DataBinder.Eval(e.Row.DataItem, "personPhoto");
 
        //图片路径
 
        string strPath = "~/photo/" + strPersonName.Trim() + ".JPG";
 
        string strPhotoPath = Server.MapPath(strPath);
 
        //保存图片文件
 
        BinaryWriter bw = new BinaryWriter(File.Open(strPhotoPath, FileMode.OpenOrCreate));
 
        bw.Write(photo);
 
        bw.Close();
 
        //显示图片
 
        tmp_Image.ImageUrl = strPath;
 
    }   
 
}