GridView控件 Image控件 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
--------------------------
//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)
////////////这里的Server.MapPath()就是将上传的图片保存到***地址/////////////////
//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>
//绑定
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
}
}
***************************
#region 相册Grid按钮事件
protected void gv_PhotoInfo_RowCommand(object sender, GridViewCommandEventArgs e)
{
GridViewRow currRow = (GridViewRow)((Button)e.CommandSource).Parent.Parent
string strPhotoID = currRow.Cells[0].Text.ToString()
string strPhotoName = currRow.Cells[1].Text.ToString()
if (e.CommandName == "btn_Edit")//照片属性修改
{
Response.Redirect("PhotoEdit.aspx?PhotoID=" + strPhotoID + "&PhotoName=" + strPhotoName)
}
else if (e.CommandName == "btn_Detail")//照片内容查看
{
this.img1.Src = "PhotoShow.aspx?PhotoID=" + strPhotoID
this.img1.Visible = true
}
else if (e.CommandName == "btn_Delete")//照片删除
{
}
}
#endregion
PhotoShow.aspx页面
===============
using System
using System.Data
using System.Configuration
using System.Collections
using System.Web
using System.Web.Security
using System.Web.UI
using System.Web.UI.WebControls
using System.Web.UI.WebControls.WebParts
using System.Web.UI.HtmlControls
using System.Data.SqlClient
using System.IO
public partial class PhotoShow : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
try
{
#region 原图
//int intPhotoID = Convert.ToInt32(Request.QueryString["PhotoID"].Trim())
//string strSql = " SELECT PhotoContent FROM PhotoInfo "
//strSql += " WHERE PhotoID = " + intPhotoID + " "
//DataTable dt = DBClass.RunSelectGetDataTable(strSql)
//byte[] photo = (byte[])dt.Rows[0]["PhotoContent"]
//this.Response.BinaryWrite(photo)
#endregion
#region 规定宽高的图
//int intPhotoID = Convert.ToInt32(Request.QueryString["PhotoID"].Trim())
int intPhotoID = 1
//int intHeight = Request.QueryString["PhotoHeight"].Trim()
int intHeight = 500
//int intWidth = Request.QueryString["PhotoWidth"].Trim()
int intWidth =500
string strSql = " SELECT PhotoContent FROM PhotoInfo "
strSql += " WHERE PhotoID = " + intPhotoID + " "
DataTable dt = DBClass.RunSelectGetDataTable(strSql)
byte[] photo = (byte[])dt.Rows[0]["PhotoContent"]
//this.Response.BinaryWrite(photo)
System.IO.MemoryStream ms = new MemoryStream(photo)
System.Drawing.Image img = System.Drawing.Image.FromStream(ms)
System.Drawing.Image newImg = img.GetThumbnailImage(intWidth, intHeight, null, new System.IntPtr())
newImg.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif)
#endregion
}
catch(Exception ex)
{
}
}
}
*************************
#region 上传 按钮 事件
protected void btn_Upload_Click(object sender, EventArgs e)
{
using (SqlConnection sqlConn = new SqlConnection(DBClass.DBConnString()))
{
sqlConn.Open()
int intImageSize
string strImageType
Stream ImageStream
intImageSize = this.FileUpload1.PostedFile.ContentLength
ImageStream = this.FileUpload1.PostedFile.InputStream
strImageType = this.FileUpload1.PostedFile.ContentType
Byte[] ImageContent = new Byte[intImageSize]
int intStatus
intStatus = ImageStream.Read(ImageContent, 0, intImageSize)
String strSql = "INSERT INTO PhotoInfo( AlbumID, PhotoName, PhotoType "
strSql += " , PhotoContent, PhotoByteSize, PhotoNote )"
strSql += " VALUES( '" + Request.QueryString["AlbumID"].Trim() + "' "
strSql += " ,'" + this.txt_PhotoName.Text.Trim() + "' "
strSql += " ,'" + this.FileUpload1.PostedFile.ContentType + "' "
strSql += " ,@photoBinary "
strSql += " ," + this.FileUpload1.PostedFile.ContentLength + " "
strSql += " ,'" + this.txt_PhotoNote.Text.Trim() + "' "
strSql += " ) "
SqlCommand sqlComm = new SqlCommand(strSql, sqlConn)
sqlComm.Parameters.Add("@photoBinary", SqlDbType.Image, intImageSize)
sqlComm.Parameters["@photoBinary"].Value = ImageContent
sqlComm.ExecuteNonQuery()
sqlConn.Close()
}
CommonHelper.DoAlert(this.Page, "上传成功")
this.txt_PhotoName.Text = ""
this.txt_PhotoNote.Text = ""
}
#endregion
