CA1300：指定 MessageBoxOptions

类型名	SpecifyMessageBoxOptions
CheckId	CA1300
类别	Microsoft.Globalization
是否重大更改	非重大更改

原因

某方法调用了未采用 System.Windows.Forms.MessageBoxOptions 参数的 MessageBox.Show 方法的重载。

规则说明

要为使用从右向左阅读顺序的区域性正确显示消息框，必须将 MessageBoxOptions 枚举的 RightAlign 和 RtlReading 成员传递给 Show 方法。 检查包含控件的 Control.RightToLeft 属性以确定是否使用从右向左的阅读顺序。

如何解决冲突

要修复与该规则的冲突，请调用采用 MessageBoxOptions 参数的 Show 方法的重载。

何时禁止显示警告

如果不是针对使用从右向左阅读顺序的区域性来本地化代码库，则可以安全地禁止显示此规则发出的警告。

示例

下面的示例演示消息框的显示方法，该消息框带有适用于从右向左阅读顺序的区域性的选项。 需要资源文件（未显示）才能生成此示例。 按照示例中的注释进行操作，可以不使用资源文件生成示例并测试从右向左功能。

Imports System
Imports System.Globalization
Imports System.Resources
Imports System.Windows.Forms

Namespace GlobalizationLibrary
    Class Program

        <STAThread()> _
        Shared Sub Main()
            Dim myForm As New SomeForm()

            ' Uncomment the following line to test the right to left feature.
            ' myForm.RightToLeft = RightToLeft.Yes
            Application.Run(myForm)
        End Sub
    End Class

    Public Class SomeForm : Inherits Form
        Private _Resources As ResourceManager
        Private WithEvents _Button As Button

        Public Sub New()
            _Resources = New ResourceManager(GetType(SomeForm))
            _Button = New Button()
            Controls.Add(_Button)
        End Sub

        Private Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs) Handles _Button.Click
            ' Switch the commenting on the following 4 lines to test the form.
            'Dim text As String = "Text"
            'Dim caption As String = "Caption"
            Dim text As String = _Resources.GetString("messageBox.Text")
            Dim caption As String = _Resources.GetString("messageBox.Caption")

            RtlAwareMessageBox.Show(CType(sender, Control), text, caption, _
            MessageBoxButtons.OK, MessageBoxIcon.Information, _
            MessageBoxDefaultButton.Button1, CType(0, MessageBoxOptions))
        End Sub
    End Class

    Public Module RtlAwareMessageBox

        Public Function Show(ByVal owner As IWin32Window, ByVal text As String, ByVal caption As String, ByVal buttons As MessageBoxButtons, ByVal icon As MessageBoxIcon, ByVal defaultButton As MessageBoxDefaultButton, ByVal options As MessageBoxOptions) As DialogResult
            If (IsRightToLeft(owner)) Then
                options = options Or MessageBoxOptions.RtlReading Or _
                MessageBoxOptions.RightAlign
            End If

            Return MessageBox.Show(owner, text, caption, _
            buttons, icon, defaultButton, options)
        End Function

        Private Function IsRightToLeft(ByVal owner As IWin32Window) As Boolean
            Dim control As Control = TryCast(owner, Control)

            If (control IsNot Nothing) Then
                Return control.RightToLeft = RightToLeft.Yes
            End If

            ' If no parent control is available, ask the CurrentUICulture
            ' if we are running under right-to-left.
            Return CultureInfo.CurrentUICulture.TextInfo.IsRightToLeft
        End Function
    End Module
End Namespace

using System;
using System.Globalization;
using System.Resources;
using System.Windows.Forms;

namespace GlobalizationLibrary
{
    class Program
    {
        [STAThread]
        static void Main()
        {
            SomeForm myForm = new SomeForm();
            // Uncomment the following line to test the right-to-left feature.
            //myForm.RightToLeft = RightToLeft.Yes;
            Application.Run(myForm);
        }
    }

    public class SomeForm : Form
    {
        private ResourceManager _Resources;
        private Button _Button;
        public SomeForm()
        {
            _Resources = new ResourceManager(typeof(SomeForm));
            _Button = new Button();
            _Button.Click += new EventHandler(Button_Click);
            Controls.Add(_Button);
        }

        private void Button_Click(object sender, EventArgs e)
        {
            // Switch the commenting on the following 4 lines to test the form.
            // string text = "Text";
            // string caption = "Caption";
            string text = _Resources.GetString("messageBox.Text");
            string caption = _Resources.GetString("messageBox.Caption");
            RtlAwareMessageBox.Show((Control)sender, text, caption,
            MessageBoxButtons.OK, MessageBoxIcon.Information,
            MessageBoxDefaultButton.Button1, (MessageBoxOptions)0);
        }
    }

    public static class RtlAwareMessageBox
    {
        public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options)
        {
            if (IsRightToLeft(owner))
            {
                options |= MessageBoxOptions.RtlReading |
                MessageBoxOptions.RightAlign;
            }

            return MessageBox.Show(owner, text, caption,
            buttons, icon, defaultButton, options);
        }

        private static bool IsRightToLeft(IWin32Window owner)
        {
            Control control = owner as Control;

            if (control != null)
            {
                return control.RightToLeft == RightToLeft.Yes;
            }

            // If no parent control is available, ask the CurrentUICulture
            // if we are running under right-to-left.
            return CultureInfo.CurrentUICulture.TextInfo.IsRightToLeft;
        }
    }
}

请参见

参考

System.Resources.ResourceManager

概念

桌面应用程序中的资源