Question

我在使用SQL读取图像和在asp：Image控件中可视化时遇到一些问题。场景是：

从本地计算机上传图片
网站将图片文件转换为位数组并保存
然后从表中读取它并将其解析为特定的asp：Image

我有以下代码：

<asp:Content ID="wrapperContent" ContentPlaceHolderID="wrapper" Runat="Server">

    <asp:Image ID="profileImage" runat="server" ImageUrl="<%=img %>" /><br />

    <asp:Button ID="ChangeImage" runat="server" Text="Change Photo" OnClick="ChangeImage_Click" />

    <asp:FileUpload ID="FileUpload" runat="server" Visible="false" />

    <asp:Button ID="UploadImage" runat="server" Text="Upload Photo" visible="false" OnClick="UploadImage_Click"/>

</asp:Content>

代码背后：

public partial class Details : System.Web.UI.Page
{
    public int id;    
    public Bitmap bitmap;
    public string imgUrl;


    protected void Page_Load(object sender, EventArgs e)
    {   

        if (Session["userName"] != null)
        {
            string sql = "select * from users where username='" + Session["userName"]+"'";
            SqlDataReader sdr = operateData.getRow(sql);
            sdr.Read();
            id = Int32.Parse(sdr["Id"].ToString());

            sql = "select * from profiles where userId='" + id+"'";  
            SqlDataReader sdrPr = operateData.getRow(sql);
            sdrPr.Read();

        SqlConnection con = operateData.createCon();
            con.Open();
            SqlDataAdapter sda = new SqlDataAdapter(sql, con);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            DataRow row = dt.Rows[0];
            byte[] imgBytes = (byte[])row["img"];
            System.Web.UI.WebControls.Image img = new System.Web.UI.WebControls.Image();

            string filePath = Server.MapPath("temp") + "//" + "img" + DateTime.Now.Ticks.ToString() + ".png";
            FileStream fs = File.Create(filePath);
            fs.Write(imgBytes, 0, imgBytes.Length);
            fs.Flush();
            fs.Close();

            profileImage.ImageUrl = filePath;

        }
        else
        {
            Response.Redirect("Login.aspx");
        }       
    }
    protected void ChangeImage_Click(object sender, EventArgs e)
    {
        FileUpload.Visible = true;
        UploadImage.Visible = true;
    }
    protected void UploadImage_Click(object sender, EventArgs e)
    {
        if (FileUpload.HasFile)
        {
        string sql = "update profiles set img='" + img+"' where userId='" + id + "'";
            operateData.execSql(sql);            
        }
    }
}

我错过了什么..？我该怎么办呢？

Answer 1

看看这个，这应该可以帮到你

http://www.dotnetgallery.com/kb/resource21-How-to-store-and-retrieve-images-from-SQL-server-database-using-aspnet.aspx

Answer 2

请尝试以下代码。 在Web应用程序中，图像控制需要图像相对路径更改图片网址如下

profileImage.ImageUrl =＆＃34; img＆＃34; + DateTime.Now.Ticks.ToString（）+ ＆＃34; png格式＆＃34 ;;

protected void Page_Load(object sender, EventArgs e) { if (Session["userName"] != null) { string sql = "select * from users where username='" + Session["userName"]+"'"; SqlDataReader sdr = operateData.getRow(sql); sdr.Read(); id = Int32.Parse(sdr["Id"].ToString()); sql = "select * from profiles where userId='" + id+"'"; SqlDataReader sdrPr = operateData.getRow(sql); sdrPr.Read(); SqlConnection con = operateData.createCon(); con.Open(); SqlDataAdapter sda = new SqlDataAdapter(sql, con); DataTable dt = new DataTable(); sda.Fill(dt); DataRow row = dt.Rows[0]; byte[] imgBytes = (byte[])row["img"]; System.Web.UI.WebControls.Image img = new System.Web.UI.WebControls.Image(); string filePath = Server.MapPath("temp") + "//" + "img" + DateTime.Now.Ticks.ToString() + ".png"; FileStream fs = File.Create(filePath); fs.Write(imgBytes, 0, imgBytes.Length); fs.Flush(); fs.Close(); profileImage.ImageUrl = "img" + DateTime.Now.Ticks.ToString() + ".png"; } else { Response.Redirect("Login.aspx"); } }

从SQL数据表到asp的图像文件：图像控件

2 个答案: