我在内容页面中有一个标签放在母版页面内。点击多次按钮，我想在每次点击时更改标签文字。当我创建一个简单的页面而不将其嵌套在母版页中时，这很好用，但是当我在嵌套在母版页中的内容页面中使用它时，标签文本在多次点击时不会改变。
以下是代码：
Label1.Text = " "+ (i++);
（i是一个全局变量。）
这是一个大问题的模型问题。实际上我有一个大型应用程序，我从数据库中获取令牌号并在标签上显示它们。单击下一个按钮时，将显示下一个标记。当我不在主页中的内容页面占位符中放置的内容页面中添加标签时，哪个工作正常。 继承人PageLoad代码：
protected void Page_Load(object sender, EventArgs e)
{
LS.Text = Request.QueryString["val"];
Label24.Visible = false;
cnn.ConnectionString = "server=*****;database=****;username=****;password=******;";
cnn.Open();
PopulateDataTable();
if (!IsPostBack)
{
Label1.Text = ""; // display nothing when page is loaded
Label2.Text = "";
Label3.Text = "";
Label4.Text = "";
HiddenField1.Value = "0";
nextButton.Visible = false;
adjButton.Visible = false;
}
if (Request.Form["HiddenField1"] != null)
rowIndex = Convert.ToInt16(Request.Form["HiddenField1"].ToString());
}
这是按钮点击事件的代码：
' protected void nextButton_Click(object sender, EventArgs e) // Next Button
{
try
{
string query2 = "";
cnn.Open();
MySqlCommand Cmd = new MySqlCommand();
Cmd.CommandText = "SELECT location from login where user_id='" + LS.Text + "';";
Cmd.Connection = cnn;
string location = Cmd.ExecuteScalar().ToString();
Cmd.CommandText = "SELECT counter from login where user_id='" + LS.Text + "' and location = '"+location+"';";
Cmd.Connection = cnn;
string counter = Cmd.ExecuteScalar().ToString();
cnn.Close();
if (counter == "1")
{
if (rowIndex == dt.Rows.Count)
{
nextButton.Enabled = false;
resetButton.Enabled = false;
adjButton.Enabled = false;
msgTxt.Visible = true;
msgTxt.Text = "The maximum no of tokens for today have been reached.";
Label1.ForeColor = System.Drawing.Color.Black;
}
else if ((dt.Rows.Count > 0) && (rowIndex < dt.Rows.Count))
{
Label1.Text = dt.Rows[rowIndex]["token_id"].ToString();
query2 = "Insert into " + location + "(counter1) value (" + Label1.Text + ") ;";
}
else
{
msgTxt.Text = "The maximum no of tokens for today have been reached.";
}
}
else if (counter == "2")
{
cnn.Open();
Cmd.CommandText = "SELECT count(*) from " + location + " where counter1 > -1;";
Cmd.Connection = cnn;
int count = Convert.ToInt32(Cmd.ExecuteScalar());
cnn.Close();
if (count > 0)
{
if (rowIndex == count)
{
nextButton.Enabled = false;
resetButton.Enabled = false;
adjButton.Enabled = false;
msgTxt.Visible = true;
msgTxt.Text = "No more requests pending.";
Label2.ForeColor = System.Drawing.Color.Black;
//Label1.Font.Strikeout = true;
}
else if (rowIndex < count)
{
Label1.Text = dt.Rows[rowIndex]["token_id"].ToString();
Label2.Text = dt.Rows[rowIndex]["token_id"].ToString();
query2 = "update " + location + " set counter2=" + Label2.Text + " WHERE counter1=" + Label2.Text + ";";
}
}
else
{
msgTxt.Text = "No more requests pending.";
}
}
else if (counter == "3")
{
cnn.Open();
Cmd.CommandText = "SELECT count(*) from " + location + " where counter2 > -1;";
Cmd.Connection = cnn;
int count = Convert.ToInt32(Cmd.ExecuteScalar());
cnn.Close();
if (count > 0)
{
if (rowIndex == count)
{
nextButton.Enabled = false;
resetButton.Enabled = false;
adjButton.Enabled = false;
msgTxt.Visible = true;
msgTxt.Text = "No more requests pending.";
Label3.ForeColor = System.Drawing.Color.Black;
//Label1.Font.Strikeout = true;
}
else if (rowIndex < count)
{
Label1.Text = dt.Rows[rowIndex]["token_id"].ToString();
Label2.Text = dt.Rows[rowIndex]["token_id"].ToString();
Label3.Text = dt.Rows[rowIndex]["token_id"].ToString();
query2 = "update " + location + " set counter3=" + Label3.Text + " WHERE counter2=" + Label3.Text + ";";
}
}
else
{
msgTxt.Text = "No more requests pending.";
}
}
else if (counter == "4")
{
cnn.Open();
Cmd.CommandText = "SELECT count(*) from " + location + " where counter3 > -1;";
Cmd.Connection = cnn;
int count = Convert.ToInt32(Cmd.ExecuteScalar());
cnn.Close();
if (count > 0)
{
if (rowIndex == count)
{
nextButton.Enabled = false;
resetButton.Enabled = false;
adjButton.Enabled = false;
msgTxt.Visible = true;
msgTxt.Text = "No more requests pending.";
Label4.ForeColor = System.Drawing.Color.Black;
//Label1.Font.Strikeout = true;
}
else if (rowIndex < count)
{
Label1.Text = dt.Rows[rowIndex]["token_id"].ToString();
Label2.Text = dt.Rows[rowIndex]["token_id"].ToString();
Label3.Text = dt.Rows[rowIndex]["token_id"].ToString();
Label4.Text = dt.Rows[rowIndex]["token_id"].ToString();
query2 = "update " + location + " set counter4=" + Label4.Text + " WHERE counter3=" + Label4.Text + ";";
}
}
else
{
msgTxt.Text = "No more requests pending.";
}
}
rowIndex++;
HiddenField1.Value = ""+rowIndex;
MySqlDataAdapter da2 = new MySqlDataAdapter(query2, cnn);
cnn.Open();
da2.SelectCommand.ExecuteNonQuery();
cnn.Close();
}
catch
{
cnn.Close();
}
}'
答案 0 :(得分：0)
ssh在哪里递增？您将HiddenFieldValue1.Value设置为等于此值，但我看不到它增加的位置，因此它看起来会保持不变。
rowIndex应该是：
if (Request.Form["HiddenField1"] != null)
rowIndex = Convert.ToInt16(Request.Form["HiddenField1"].ToString());