RequiredFieldValidator无法以编程方式工作

Question

正如标题所说。可能有什么不妥？

我的网页上有一个常规的TextBox - <asp:TextBox ID="tb" runat="server" />

以下作品：

<asp:RequiredFieldValidator ID="r" runat="server" ControlToValidate="tb" ErrorMessage="error" />

以下不起作用：

RequiredFieldValidator rfv = new RequiredFieldValidator();
rfv.ID = "rfv";
rfv.ControlToValidate = tb.ID;
rfv.ErrorMessage = "error";

Answer 1

您需要添加必填字段验证器

RequiredFieldValidator rfv = new RequiredFieldValidator();
rfv.ID = "rfv";
rfv.ControlToValidate = tb.ID;
rfv.ErrorMessage = "error";
yourFormId.Controls.Add(rfv);// you need to add this