[英]Image file from SQL data table to asp:Image control
我在从SQL读取图像并在asp:Image控件中可视化时遇到一些问题。 该方案是:
从本地计算机上传图片
网站将图像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>
后面的代码:
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);
}
}
}
我想念什么..? 我该如何管理?
请尝试以下代码。 在Web应用程序中,图像控件需要图像相对路径,因此您必须如下更改图像url
profileImage.ImageUrl =“ img” + DateTime.Now.Ticks.ToString()+“ .png”;
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");
}
}
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