如何验证 RadioButtonList 是否在 C# 中检查/选择？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/8766324/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-08-09 04:21:26 来源:igfitidea点击:
How to validate if a RadioButtonList is check/select it in C#?
提问by jorame
I have a RadioButtonList which is being populated from a Database, users need to at at least check/select one of the RadioButtons. How can I make sure they check/select the RadioButton? I tried many different ways but no luck, here is my code. I'm also trying to alert them of the uncheck radiobutton.
我有一个从数据库填充的 RadioButtonList，用户至少需要检查/选择 RadioButtons 之一。我如何确保他们检查/选择 RadioButton？我尝试了很多不同的方法，但没有运气，这是我的代码。我还试图提醒他们取消选中单选按钮。
What I'm trying to do is to validate the RadioButtonList is checked/selected.
我想要做的是验证 RadioButtonList 是否被选中/选中。
if (cblstatus.SelectedItem.Value == "1")
{
//Create Category
con.Open();
SqlCommand departament = new SqlCommand("insert into categories(ca_name, ca_number, ca_status, ca_department, ca_date, ca_time, ca_user) " +
"values('" + category.Text + "', '" + number.Text + "', 'Y', '" + catdepartment.SelectedValue + "', '" + date + "', '" + time + "', '" + user + "')", con);
departament.ExecuteNonQuery();
con.Close();
}
else if (cblstatus.SelectedItem.Value == "2")
{
//Create Category
con.Open();
SqlCommand departament = new SqlCommand("insert into categories(ca_name, ca_number, ca_status, ca_department, ca_date, ca_time, ca_user) " +
"values('" + category.Text + "', '" + number.Text + "', 'N', '" + catdepartment.SelectedValue + "', '" + date + "', '" + time + "', '" + user + "')", con);
departament.ExecuteNonQuery();
con.Close();
}
else if (cblstatus. == null)
{
alert.InnerHtml = "<div id=\"warning\" class=\"message warning\">Warning! Please select a department.</div>" +
"<script>" +
"setTimeout(function () { $('#success').fadeOut(); }, 2000);" +
"</script>";
}
回答by Wahtever
instead of doing it on the code behind use an asp.net required field validator:
而不是在后面的代码上使用 asp.net 必需的字段验证器：
here is an example:
这是一个例子：
<asp:RadioButtonList runat="server" ID="gender" RepeatDirection="Horizontal" RepeatLayout="Flow" CssClass="labels">
<asp:ListItem Text="Male" Value="Male"></asp:ListItem>
<asp:ListItem Text="Female" Value="Female"></asp:ListItem>
<asp:RequiredFieldValidator runat="server" ID="genderRequired" Display="Dynamic"
ControlToValidate="gender" ErrorMessage="This is an Error"
ValidationGroup="signUp">*</asp:RequiredFieldValidator>
on the code behind you can create a blank div and then add text to it on error and you can use the jquery change function to manipulate it further:
在后面的代码中，您可以创建一个空白 div，然后在出错时向其中添加文本，您可以使用 jquery 更改功能进一步操作它：
if (gender.SelectedItem.Value == "Male")
{
//do stuff
}
else if (gender.SelectedItem.Value == "Female")
{
//do stuff
}
else
{
errorDiv.InnerText = "Error Messeage";
}
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.requiredfieldvalidator.aspx
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.requiredfieldvalidator.aspx
回答by Syed Mohamed
We can use normal RequiredFieldValidation with not defining InitialValue property
我们可以使用普通的 RequiredFieldValidation 而不定义 InitialValue 属性
<asp:RadioButtonList runat="server" ID="Radioyesno" RepeatDirection="Horizontal">
<asp:ListItem>Yes</asp:ListItem>
<asp:ListItem>No</asp:ListItem>
</asp:RadioButtonList>
<asp:RequiredFieldValidator runat="server" ID="RFV123" ValidationGroup="VG1" ControlToValidate="Radioyes" ErrorMessage="PLEASE SELECT YES/NO"/>
it works for me, no complex thinking
它对我有用，没有复杂的想法
回答by helavin4ik
.aspx :
.aspx :
<asp:RadioButtonList ID="rbAny" runat="server" >
<asp:ListItem Value="rb1" Text="something1"></asp:ListItem>
<asp:ListItem Value="rb2" Text="something2"></asp:ListItem>
<asp:ListItem Value="rb3" Text="something3"></asp:ListItem>
</asp:RadioButtonList>
.aspx.cs :
add/insert values in ViewState(for example by clicking a buttons):
.aspx.cs ：
在 ViewState 中添加/插入值（例如通过单击按钮）：
protected void btnSend_Click(object sender, EventArgs e)
{
foreach (ListItem r in rbAny.Items)
if (r.Selected) ViewState["anyValue"] = r.Text;
}
read value from ViewState:
从 ViewState 读取值：
protected void btnShow_Click(object sender, EventArgs e)
{
StringBuilder str = new StringBuilder();
str.Append("anyValue: " + ViewState["anyValue"]);
someLabel.Text = str.ToString();
}
回答by Vijay Kumbhoje
Can use this approach but totally code behind
可以使用这种方法，但完全代码落后
public bool ValidateRadioButtonList()
{
bool rbchecked= false;
for (int i = 0; i < RadioButtonList1.Items.Count - 1; i++)
{
if (RadioButtonList1.Items[i].Selected==true)
{
rbchecked = true;
}
}
if (rbchecked == true)
{
lblError.Text = string.Empty;
return true;
}
else
{
lblError.Text = "Please select RadioButton!";
return false;
}
}
回答by John
Imports System.IO
Imports System.Text
Imports System
Public Class WebForm1
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
'Protected Sub Calendar1_SelectionChanged(sender As Object, e As EventArgs)
' TextBox1.Text = Calendar1.SelectedDate.ToShortDateString()
' Calendar1.Visible = False
'End Sub
'Protected Sub LinkButton1_Click(sender As Object, e As EventArgs)
' 'Calendar1.Visible = True
'End Sub
'Protected Sub LinkButton2_Click(sender As Object, e As EventArgs)
' Calendar2.Visible = True
'End Sub
'Protected Sub Calendar2_SelectionChanged(sender As Object, e As EventArgs)
' TextBox2.Text = Calendar2.SelectedDate.ToShortDateString()
' Calendar2.Visible = False
'End Sub
Public Sub DownloadCSV()
Dim csvPath1 As String = "D:\CSVFile1.csv"
'Download and read all Text within the uploaded Text file.
Dim csvContentStr1 As String = File.ReadAllText(csvPath1)
Dim split As String() = csvContentStr1.Split(","c)
'Here you can see the output as CSV content.
'Response.Write(csvContentStr)
End Sub
Public Sub UploadCSV()
Dim csvContent As New StringBuilder()
DownloadCSV()
Dim dt1 As DateTime = Convert.ToDateTime(TextBox1.Text)
Dim dt2 As DateTime = Convert.ToDateTime(TextBox2.Text)
Dim dt3 As TimeSpan = dt2.Subtract(dt1)
Dim NoOfDays As Integer = dt3.Days + 1
'TextBox3.Text = NoOfDays.ToString
Dim index As DateTime = Convert.ToDateTime(TextBox1.Text)
While index <= Convert.ToDateTime(TextBox2.Text)
If index.DayOfWeek = DayOfWeek.Saturday OrElse index.DayOfWeek = DayOfWeek.Sunday Then
NoOfDays = NoOfDays - 1
End If
index = index.AddDays(1)
End While
Dim a1 As String = TextBox1.ToString()
Dim b1 As String = TextBox2.ToString()
Dim c1 As String = RadioButtonList1.Text.ToString()
Dim d1 As String = TextBox3.ToString()
Dim z1 As String = TextBox1.Text + "," + TextBox2.Text + "," + RadioButtonList1.Text + "," + TextBox3.Text + "," + NoOfDays.ToString
'csvContent.AppendLine("From Date,To Date,Laeve Type,Reason")
csvContent.AppendLine(z1)
Dim csvPath As String = "D:\CSVFile2.csv"
' Save or upload CSV format File (.csv)
File.AppendAllText(csvPath, csvContent.ToString())
End Sub
Protected Sub Button1_Click(sender As Object, e As EventArgs)
If Page.IsValid Then
Dim a1 As String = TextBox1.ToString()
Dim b1 As String = TextBox2.ToString()
Dim c1 As String = RadioButtonList1.Text.ToString()
Dim d1 As String = TextBox3.ToString()
UploadCSV()
DownloadCSV()
End If
End Sub
Protected Sub Button2_Click(sender As Object, e As EventArgs)
End Sub
End Class
Aspx Code
Aspx 代码
<%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/Site1.Master" CodeBehind="WebForm1.aspx.vb" Inherits="Leave12.WebForm1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<table>
<tr>
<%-- <td>
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click" >Select From Date.....</asp:LinkButton>
</td>
<td>
<asp:Calendar ID="Calendar1" runat="server" Visible="false" OnSelectionChanged="Calendar1_SelectionChanged" ></asp:Calendar>
</td>
<td>
<asp:TextBox ID="TextBox1" ReadOnly="true" runat="server"></asp:TextBox>
</td>--%>
<td>
<asp:Label ID="Label1" runat="server" Text="Please enter From Date"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox1" TextMode="Date" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Please enter From Date" Display="Dynamic" ControlToValidate="TextBox1"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<%-- <td>
<asp:LinkButton ID="LinkButton2" runat="server" OnClick="LinkButton2_Click">Select To Date.....</asp:LinkButton>
</td>
<td>
<asp:Calendar ID="Calendar2" runat="server" Visible="false" OnSelectionChanged="Calendar2_SelectionChanged" ></asp:Calendar>
</td>
<td>
<asp:TextBox ID="TextBox2" ReadOnly="true" runat="server"></asp:TextBox>
</td>--%>
<%--<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Please enter To Date" Display="Dynamic" ControlToValidate="TextBox2"></asp:RequiredFieldValidator>
</td>--%>
<td>
<asp:Label ID="Label2" runat="server" Text="Please enter To Date"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox2" TextMode="Date" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Please enter To Date" Display="Dynamic" ControlToValidate="TextBox2"></asp:RequiredFieldValidator>
</td>
<td>
<asp:CompareValidator ID="CompareValidator1" runat="server" ErrorMessage="To Date should be greater than From Date" Display="Dynamic" Operator="GreaterThanEqual" ControlToCompare="TextBox1" ControlToValidate="TextBox2"></asp:CompareValidator>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label3" runat="server" Text="Please select Leave Type"></asp:Label>
</td>
<td>
<asp:RadioButtonList RepeatDirection="Horizontal" ID="RadioButtonList1" runat="server" >
<asp:ListItem Selected="True" >Casual Leave</asp:ListItem>
<asp:ListItem>Sick Leave</asp:ListItem>
<asp:ListItem>Earned Leave</asp:ListItem>
</asp:RadioButtonList>
</td>
</tr>
<%--<tr>
<td>
<asp:Label ID="Label2" runat="server" Text="Reason"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox3" TextMode="MultiLine" Rows="5" Columns="50" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ErrorMessage="Please select Reason" ControlToValidate="TextBox3" Display="Dynamic"></asp:RequiredFieldValidator>
</td>
</tr>--%>
<tr>
<td>
<asp:Label ID="Label4" runat="server" Text="Reason"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox3" TextMode="MultiLine" MaxLength="250" Rows="5" Columns="50" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="Please provide reason for leave" Display="Dynamic" ControlToValidate="TextBox3"></asp:RequiredFieldValidator>
</td>
<td>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" ValidationExpression="^[\s\S]{0,100}$" runat="server" ErrorMessage="Please enter maximum of 250 characters" Display="Dynamic" ControlToValidate="TextBox3"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />
</td>
<td>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Reset" />
</td>
</tr>
</table>
</asp:Content>
