asp.net实现存储和读取数据库图片

2020-01-17 20:30:25

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本文实例为大家分享了asp.net存储和读取数据库图片的具体代码，供大家参考，具体内容如下

1. 创建asp.net web窗体项目

代码如下：

<body>  <form id="form1" runat="server">    <h2>上传图片</h2>    <div>      <asp:FileUpload ID="ful_image" runat="server" />      <asp:Button ID="btn_submit" runat="server" Text="提交" />       <asp:Label ID="lbl_message" runat="server" Text="Label"></asp:Label>    </div>     <h2>展示图片</h2>    <div>      <asp:Button ID="btn_show" runat="server" Text="展示图片" />      <asp:Panel ID="pn_images" runat="server"></asp:Panel>    </div>  </form></body>

效果图如下：

2. 创建数据库

数据库脚本如下：

create database Imagetest go use Imagetest CREATE TABLE [dbo].[imageTable]( [ID] [int] IDENTITY(1,1) NOT NULL, [imageData] [image] NULL, CONSTRAINT [PK_imageTable] PRIMARY KEY CLUSTERED ( [ID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

数据库生成结果图：

3.使用EF实现图片存储

实现代码：

protected void btn_submit_Click(object sender, EventArgs e)    {      ImagetestEntities ie = new ImagetestEntities();      imageTable it = new imageTable();      it.imageData = ful_image.FileBytes;      it= ie.imageTables.Add(it);      ie.SaveChanges();      if(it.ID!=0)      {        lbl_message.Text = "图片上传成功";      }      else      {        lbl_message.Text = "图片上传失败";      }    }

运行结果：

4. 使用EF实现图片的展示

实现代码：

protected void btn_show_Click(object sender, EventArgs e)    {      ImagetestEntities ie = new ImagetestEntities();      List<imageTable> list= ie.imageTables.ToList<imageTable>();      foreach (imageTable item in list)      {        Image img = new Image();        img.ImageUrl ="data:image/png;base64,"+ Convert.ToBase64String(item.imageData);        pn_images.Controls.Add(img);      }    }

运行结果：