Question

我在Page_Init上添加了一组图像，点击某些按钮我想更新这些图像。由于某种原因，它不起作用。为什么呢？

这是我的代码：

    protected void Page_Init(object sender, EventArgs e)
    {
    ...
    for (int i = 0; i < questionsCount; i++)
        {
            TableRow newTableRow = new TableRow();
            TableTestAnswers.Rows.Add(newTableRow);
            TableCell questionNumberCell = new TableCell();
            newTableRow.Cells.Add(questionNumberCell);
            LinkButton questionNumberLinkButton = new LinkButton();
            questionNumberCell.Controls.Add(questionNumberLinkButton);
            questionNumberLinkButton.Text = ((char)(i + 'A')).ToString();           

            TableCell answersCell = new TableCell();
            newTableRow.Cells.Add(answersCell);
            answersCell.ID = "AnswersCell-" + i.ToString();

            for (int j = 0; j < answersCount[i]; j++)
            {
                Image answerImage = new Image();
                answersCell.Controls.Add(answerImage);
                answerImage.ID = "Answer-" + i.ToString() + "-" + j.ToString();
                answerImage.ImageUrl = Resources.Images.AnswerEmptySquareUrl;
            }

    protected void ButtonSubmit_Click(object sender, EventArgs e)
    {
    ...        
        Image answerImage = (Image)TableTestAnswers.FindControl(
             "Answer-" + questionIndex.ToString() + "-" + answerIndex.ToString());
        answerImage.ImageUrl = Resources.Images.AnswerMarkedUrl;
        answerImage.ViewStateMode = System.Web.UI.ViewStateMode.Enabled;
    }

我可以看到ButtonSubmit找到正确的控件并更改其属性，但在对客户端的响应中，我仍然看到旧图像。救命啊！

Answer 1

这可能是图像缓存的情况，即新图像的文件名是否与旧图像的文件名相同？

ImageUrl不会更改动态添加的图像

1 个答案: