当前场景： Decimal数据类型输入选择的主DDL会生成新的DDL。从新DDL输入选择后，它会生成两个标签和两个带+按钮的文本框。
当前问题：如果我单击+按钮，则会隐藏最近生成的动态Web控件。如何避免隐藏控件并在每个+按钮单击事件上连续生成它们
我的C＃代码：
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindDropDownLists();
}
else
{
if (!String.IsNullOrEmpty(DropDownList5.SelectedValue))
{
if (DropDownList5.SelectedValue == "decimal")
{
createdynamiccontrols_decimal();
}
}
}
}
protected void DropDownList5_SelectedIndexChanged(object sender, EventArgs e)
{
}
protected void createdynamiccontrols_decimal()
{
int i = DropDownList5.SelectedIndex;
++i;
TableRow row = new TableRow();
row.ID = "TableRow_" + i.ToString();
TableCell cell1 = new TableCell();
DropDownList Range_DDL_Decimal = new DropDownList();
Range_DDL_Decimal.ID = "RandeDDL_Decimal" + i.ToString();
Range_DDL_Decimal.Items.Insert(0, new ListItem("--Select--", "--Select--"));
Range_DDL_Decimal.Items.Insert(1, new ListItem("Equal", "Equal"));
Range_DDL_Decimal.Items.Insert(2, new ListItem("NotEqual", "NotEqual"));
Range_DDL_Decimal.Items.Insert(3, new ListItem("greater than", "greater than"));
Range_DDL_Decimal.Items.Insert(4, new ListItem("lesser than", "lesser than"));
Range_DDL_Decimal.Items.Insert(5, new ListItem("greater than or equal to", "greater than or equal to"));
Range_DDL_Decimal.Items.Insert(6, new ListItem("lesser than or equal to", "lesser than or equal to"));
Range_DDL_Decimal.Items.Insert(7, new ListItem("Contains", "Contains"));
Range_DDL_Decimal.Items.Insert(8, new ListItem("Is Null", "Is Null"));
Range_DDL_Decimal.Items.Insert(9, new ListItem("Is Not Null", "Is Not Null"));
Range_DDL_Decimal.Items.Insert(10, new ListItem("Between", "Between"));
Range_DDL_Decimal.AutoPostBack = true;
Range_DDL_Decimal.SelectedIndexChanged += new System.EventHandler(Range_DDL_Decimal_SelectedIndexChanged);
cell1.Controls.Add(Range_DDL_Decimal);
//// Add the TableCell to the TableRow
row.Cells.Add(cell1);
dynamic_filter_table.Rows.Add(row);
dynamic_filter_table.EnableViewState = true;
ViewState["dynamic_filter_table"] = true;
}
protected void Range_DDL_Decimal_SelectedIndexChanged(object sender, EventArgs e)
{
int j = DropDownList5.SelectedIndex;
++j;
TableRow rowtwo;
rowtwo = new TableRow();
TableCell cell1 = new TableCell();
TableCell cell2 = new TableCell();
TableCell cell3 = new TableCell();
TextBox tb1 = new TextBox();
TextBox tb2 = new TextBox();
Label lbl1 = new Label();
Label lbl2 = new Label();
// Set a unique ID for each TextBox added
tb1.ID = "lowerbound_" + j.ToString();
tb2.ID = "upperbound_" + j.ToString();
lbl1.Text = "LowerBound:";
lbl1.Font.Size = FontUnit.Point(10);
lbl1.Font.Bold = true;
lbl1.Font.Name = "Arial";
lbl2.Text = "UpperBound:";
lbl2.Font.Size = FontUnit.Point(10);
lbl2.Font.Bold = true;
lbl2.Font.Name = "Arial";
Button addmore = new Button();
addmore.ID = "Button_Decimal" + j.ToString();
addmore.Text = "+";
addmore.Click += new System.EventHandler(Addmore_click);
**//If this button is clicked the Dynamic controls are vanished**
cell1.Controls.Add(lbl1);
cell1.Controls.Add(tb1);
cell2.Controls.Add(lbl2);
cell2.Controls.Add(tb2);
cell3.Controls.Add(addmore);
rowtwo.Cells.Add(cell1);
rowtwo.Cells.Add(cell2);
rowtwo.Cells.Add(cell3);
dynamic_filter_table.Rows.Add(rowtwo);
dynamic_filter_table.EnableViewState = true;
ViewState["dynamic_filter_table"] = true;
}
protected void Addmore_click(object sender, EventArgs e)
{
**//Generate dynamic controls on every click of + button
//How to procced**
}
protected void Page_PreInit(object sender, EventArgs e)
{
}