C#教程之gridview 显示图片的实例代码

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C#教程之gridview 显示图片的实例代码

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

复制代码代码如下:

//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 = http://www.cnblogs.com/wycoo/archive/2012/02/07/photo;

myConn.Open();

myComm.ExecuteNonQuery();

myConn.Close();

}

2.读取二进制图片在页面显示

复制代码代码如下:

//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

复制代码代码如下:

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

复制代码代码如下:

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

复制代码代码如下:

this.Image1.ImageUrl = strPath;

//4.GridView中ImageField以URL方式显示图片

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

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">

<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

复制代码代码如下:

//样板列
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">

<asp:BoundField DataField="personName" HeaderText="姓名" />

<asp:ImageField DataImageUrlField="personPhotoPath"

HeaderText="图片">

</asp:ImageField>

<asp:TemplateField HeaderText="图片">

<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;

}
}

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