GridView控件显示图片

2022-10-27 09:51:01

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

====================

1.将图片以二进制存入数据库

Code//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

Code

//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

Code

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

Code

----------------------------

<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

Code

//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;

    }   

}

码农公寓

相关文章