上传图片到文件夹并显示在GridView控件里面

http://aspsnippets.com/Articles/Upload-images-to-folder-and-display-uploaded-images-in-ASPNet-GridView-using-C-and-VBNet.aspx

1. Html 页面

 <div>

    <asp:FileUpload ID="FileUpload1" runat="server" />

    <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" /><hr />

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

    <Columns>

        <asp:BoundField DataField="Text" />

        <asp:ImageField DataImageUrlField="Value" ControlStyle-Height="100" ControlStyle-Width="100" />

    </Columns>

</asp:GridView>

    </div>

View Code

2. 添加命名空间

using System.IO;

using System.Collections.Generic;

3. 上传文件按钮事件

   protected void btnUpload_Click(object sender, EventArgs e)

        {

            if (FileUpload1.HasFile)

            {

                string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);

                FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Image/") + fileName);

                Response.Redirect(Request.Url.AbsoluteUri);

            }

        }

View Code

4.Page_Load 事件--加载图片并显示在GridView中

 protected void Page_Load(object sender, EventArgs e)

        {

            if (!IsPostBack)

            {

                string[] filePaths = Directory.GetFiles(Server.MapPath("~/Image/"));

                List<ListItem> files = new List<ListItem>();

                foreach (string filePath in filePaths)

                {

                    string fileName = Path.GetFileName(filePath);

                    files.Add(new ListItem(fileName, "~/Image/" + fileName));

                }

                GridView1.DataSource = files;

                GridView1.DataBind();

            }

        }

View Code

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从数据库获取binary形式存储的文件（[Image]是图片字段，以Binary形式存储）

http://www.beansoftware.com/ASP.NET-Tutorials/Save-Read-Image-Database.aspx

 

protected void btnDisplayImage_Click(object sender, EventArgs e)

        {

            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString))

            {

                conn.Open();

                SqlCommand cmd = new SqlCommand("select[Image] from SaveImageByBinary where id =1",conn);

                byte[] img=(byte[])cmd.ExecuteScalar();

                MemoryStream ms = new MemoryStream();

                ms.Write(img, 0, img.Length);



                Bitmap bt = new Bitmap(ms);

                Response.ContentType = "image/jpeg";

                //bt.Save(Response.OutputStream, ImageFormat.Jpeg);

                string filename = Server.MapPath("~/Image/12456.jpeg");

                bt.Save(Response.OutputStream, ImageFormat.Jpeg);

            }

        }