在sqlserver中插入和读取图片_sqlserver2017 插入图像-优快云博客

本文介绍如何使用ASP.NET中的DataGrid从数据库检索并显示用户的图片。通过C#代码实现连接数据库、读取用户信息及图片数据，并在网页上展示。

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<%@ Page language="c#" debug="true" Codebehind="DataGridShowImage.aspx.cs" AutoEventWireup="false"
Inherits="eMeng.Exam.DataGridShowImage.DataGridShowImage" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>从数据库中取得照片并显示在DataGrid中</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="DataGridShowImage" method="post" runat="server">
<h3 align="center">从数据库中取得照片并显示在DataGrid中</h3>
<asp:DataGrid ID="DG_Persons" AutoGenerateColumns="False" Width="99%" HeaderStyle-BackColor="#ff0000"
   HeaderStyle-Font-Bold="True" HeaderStyle-ForeColor="#ffffff" ItemStyle-BackColor="Beige"
    BorderColor="#000000" Runat="server" HeaderStyle-HorizontalAlign="Center">
<Columns>
    <asp:TemplateColumn HeaderText="姓名">
      <ItemTemplate>
        <asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonName") %>' ID="Label1"/>
      </ItemTemplate>
    </asp:TemplateColumn>
    <asp:TemplateColumn HeaderText="电子邮件">
      <ItemTemplate>
        <asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonEmail") %>' ID="Label2"/>
      </ItemTemplate>
    </asp:TemplateColumn>
    <asp:TemplateColumn HeaderText="性别">
      <ItemTemplate>
        <asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonSex") %>' ID="Label3"/>
      </ItemTemplate>
    </asp:TemplateColumn>
    <asp:TemplateColumn HeaderText="出生日期">
      <ItemTemplate>
        <asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonDOB") %>' ID="Label4"/>
      </ItemTemplate>
    </asp:TemplateColumn>
    <asp:TemplateColumn HeaderText="照片">
      <ItemTemplate>
        <asp:Image Runat=server ID="Image1"
         ImageUrl='<%# FormatURL(DataBinder.Eval(Container.DataItem, "PersonID")) %>' />
      </ItemTemplate>
    </asp:TemplateColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</HTML>

DataGridShowImage.aspx.cs
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.Data.SqlClient; namespace eMeng.Exam.DataGridShowImage { /// <summary> /// DataGridShowImage 的摘要说明。 /// </summary> public class DataGridShowImage : System.Web.UI.Page { protected System.Web.UI.WebControls.DataGrid DG_Persons; private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 if(!this.IsPostBack) { BindGrid(); } } private void BindGrid() { string strCnn = "Data Source=.;Initial Catalog=mxh;User Id=sa;Password=;"; SqlConnection myConnection = new SqlConnection(strCnn); SqlCommand myCommand = new SqlCommand("SELECT * FROM Person", myConnection); myCommand.CommandType = CommandType.Text; try { myConnection.Open(); DG_Persons.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection); DG_Persons.DataBind(); } catch(SqlException SQLexc) { Response.Write("提取数据时出现错误：" + SQLexc.ToString()); } } protected string FormatURL(object strArgument) { return "ReadImage.aspx?id=" + strArgument.ToString(); } #region Web Form Designer generated code 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.Load += new System.EventHandler(this.Page_Load); } #endregion } }

ReadImage.aspx

<%@ Page language="c#" Codebehind="ReadImage.aspx.cs" AutoEventWireup="false"
Inherits="eMeng.Exam.DataGridShowImage.ReadImage" %>

ReadImage.aspx.cs
using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Data.SqlClient; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace eMeng.Exam.DataGridShowImage { /// <summary> /// ReadImage 的摘要说明。 /// </summary> public class ReadImage : System.Web.UI.Page { private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 string strImageID = Request.QueryString["id"]; SqlConnection myConnection = new SqlConnection("Data Source=.;Initial Catalog=mxh;User Id=sa;Password=;"); SqlCommand myCommand = new SqlCommand("Select PersonImageType, PersonImage from Person Where PersonID=" + strImageID, myConnection); try { myConnection.Open(); SqlDataReader myDataReader; myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection); if(myDataReader.Read()) { Response.Clear(); Response.ContentType = myDataReader["PersonImageType"].ToString(); Response.BinaryWrite((byte[])myDataReader["PersonImage"]); } myConnection.Close(); } catch (SqlException SQLexc) { } Response.End(); } #region Web Form Designer generated code 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.Load += new System.EventHandler(this.Page_Load); } #endregion } }