如何把图片保存到数据库中？

[yq_net]

以及如何再WinForm中把他显示出来？


谢谢

[pinkyll]

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Data.OleDb;
namespace MikeCat
{
/// <summary>
/// MikeCat_Upload_DataBase 的摘要说明。
/// ************************************************
/// 作者：迈克老猫（张琳）
/// 功能：上传文件至数据库并显示
/// ************************************************
/// </summary>
public class MikeCat_Upload_DataBase : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label strStatus;
protected System.Web.UI.WebControls.Button UploadButton;
protected System.Web.UI.HtmlControls.HtmlInputFile File1;
protected System.Web.UI.WebControls.DataGrid DataGrid1;
protected System.Web.UI.WebControls.Label Label1;
string connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + HttpContext.Current.Server.MapPath("northwind.mdb");

private void Page_Load(object sender, System.EventArgs e)
{
mfbind();
}
private void mfbind()
{
string sql="select * from uploadfile";
OleDbConnection conn=new OleDbConnection(connstr);
OleDbCommand cmd=new OleDbCommand(sql,conn);
conn.Open();
DataGrid1.DataSource=cmd.ExecuteReader();
DataGrid1.DataBind();
conn.Close();
}
#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
this.UploadButton.Click += new System.EventHandler(this.UploadButton_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void UploadButton_Click(object sender, System.EventArgs e)
{
try
{
Stream mffileStream;
int mffileSize;
string mffileName;
string mffileContentType;
string mffileUploadedName;
mffileStream = this.File1.PostedFile.InputStream; //二进制流
mffileSize = this.File1.PostedFile.ContentLength; //文件大小
mffileUploadedName = this.File1.PostedFile.FileName; //文件路径
byte[] mffileBody=new byte[mffileSize];
mffileContentType = this.File1.PostedFile.ContentType; //文件类型
mffileName =mffileUploadedName.Substring(mffileUploadedName.LastIndexOf('\\')+1);
int n = mffileStream.Read(mffileBody, 0, mffileSize);

//写库法一：
OleDbConnection conn = new OleDbConnection(connstr);
String sql ="Select * from uploadfile";
OleDbDataAdapter da = new OleDbDataAdapter(sql,conn);
DataSet ds = new DataSet();
da.Fill(ds);
OleDbCommandBuilder cb = new OleDbCommandBuilder(da);
DataRow row = ds.Tables[0].NewRow();
row["filebody"] = mffileBody; //保存数据到数据库为二进制
row["filename"] = mffileName; //保存文件名称
row["filetype"] = mffileContentType; //保存文件类型
ds.Tables[0].Rows.Add(row);
da.Update(ds);

//写库法二：
// string strCnn= "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + HttpContext.Current.Server.MapPath("northwind.mdb");
OleDbConnection conn1 = new OleDbConnection(connstr);
OleDbCommand cmd=new OleDbCommand("insert into uploadfile(filebody,filename,filetype) values(@filebody,@filename,@filetype)",conn1);
OleDbParameter parambody=new OleDbParameter("@filebody",OleDbType.VarBinary);
parambody.Value=mffileBody;
cmd.Parameters.Add(parambody);
OleDbParameter paramname=new OleDbParameter("@filename",OleDbType.VarChar,50);
paramname.Value=mffileName;
cmd.Parameters.Add(paramname);
OleDbParameter paramtype=new OleDbParameter("@filetype",OleDbType.VarChar,50);
paramtype.Value=mffileContentType;
cmd.Parameters.Add(paramtype);
conn1.Open();
int m=cmd.ExecuteNonQuery();
conn1.Close();

strStatus.Text="文件成功写入数据库！可以继续上传";
}
catch(Exception ex)
{
strStatus.Text=ex.Message.ToString();
}
}

private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
int fid=int.Parse(DataGrid1.DataKeys[(int)e.Item.ItemIndex].ToString().Trim());
((System.Web.UI.HtmlControls.HtmlImage)e.Item.FindControl("img1")).Src="ThumbnailImage.aspx?fid="+fid+"&width=150&height=150";
}
}
}
}

[pinkyll]

我平时收集的，不过没试过，看能不能帮到你

[yq_net]

谢谢
我看看先

[xuewen_no1]

用二进制流存放,网上多的是,,搜一下就OK了

[风上人]

你可以在SQL里面保存你的图片路径，在窗体读取