asp.net - Asp.Net 更新图片网址

Question

我有一个图像控件和按钮控件。我想通过单击按钮来选择新图像和更新图像。cs文件如下：

protected void Button2_Click(object sender, EventArgs e)
        {
//choose new image 
        }

Answer 1

你可以在你的 .ASPX 上尝试这样的事情：

<form id="form1" runat="server">
    <asp:Image ID="Image1" runat="server" /><br /><br />
    <asp:FileUpload id="FileUploadControl" runat="server" />
    <asp:Button runat="server" id="UploadButton" text="Upload" onclick="UploadButton_Click" />
    <br /><br />
    <asp:Label runat="server" id="StatusLabel" text="Upload status: " />
</form>

在您的 .CS 中：

protected void UploadButton_Click(object sender, EventArgs e)
{
    if(FileUploadControl.HasFile)
    {
        try
        {
            string filename = Path.GetFileName(FileUploadControl.FileName);
            FileUploadControl.SaveAs(Server.MapPath("~/YourImageFolder") + filename);
            StatusLabel.Text = "Upload status: File uploaded!";
            Image1.ImageUrl = "~/YourImageFolder" + filename;
        }
        catch(Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }
}

Answer 2

尝试这个。

protected void Button2_Click(object sender, EventArgs e) 
{ 
  image1.ImageUrl = "~/FolderName/yourimage.jpg";
}