Question

我在使用以下代码在VB 2010中编写问题。

 Public Sub about(ByVal sender As System.Object, ByVal e As System.EventArgs)
    MessageBox.Show("Omega Management System © Shelby Taylor 2013 ******@gmail.com", MessageBoxButtons.OK, MessageBoxIcon.Information)
End Sub

我将这个代码放在一个模块中，我将其用作通用“持有者”，以便在我的程序的幕后保存一些数据库连接。我想创建一个messagebox子程序，如果用户单击一个按钮，它将显示我的联系信息，在这种情况下，我将调用此过程并显示消息框。

我收到以下错误。

Error   1   Overload resolution failed because no accessible 'Show' can be called without a narrowing conversion:
'Public Shared Function Show(owner As System.Windows.Forms.IWin32Window, text As String, caption As String) As System.Windows.Forms.DialogResult': Argument matching parameter 'owner' narrows from 'String' to 'System.Windows.Forms.IWin32Window'.
'Public Shared Function Show(owner As System.Windows.Forms.IWin32Window, text As String, caption As String) As System.Windows.Forms.DialogResult': Argument matching parameter 'text' narrows from 'System.Windows.Forms.MessageBoxButtons' to 'String'.
'Public Shared Function Show(owner As System.Windows.Forms.IWin32Window, text As String, caption As String) As System.Windows.Forms.DialogResult': Argument matching parameter 'caption' narrows from 'System.Windows.Forms.MessageBoxIcon' to 'String'.
'Public Shared Function Show(text As String, caption As String, buttons As System.Windows.Forms.MessageBoxButtons) As System.Windows.Forms.DialogResult': Argument matching parameter 'caption' narrows from 'System.Windows.Forms.MessageBoxButtons' to 'String'.
'Public Shared Function Show(text As String, caption As String, buttons As System.Windows.Forms.MessageBoxButtons) As System.Windows.Forms.DialogResult': Argument matching parameter 'buttons' narrows from 'System.Windows.Forms.MessageBoxIcon' to 'System.Windows.Forms.MessageBoxButtons'. M:\oms\omega_managment_system\WindowsApplication1\globalStructures.vb   21  9   Omega Managment System

我不明白发生了什么。有人可以解释一下问题是什么，以及如何解决它？

谢谢。

Answer 1

错误消息告诉所有人：

Public Shared Function Show(text As String, caption As String, _
buttons As System.Windows.Forms.MessageBoxButtons) ...
Argument matching parameter 'caption' narrows from 
  'System.Windows.Forms.MessageBoxButtons' to 'String'.

您必须遵循这些格式。第二个arg应该是一个字符串（标题），但是你传递了按钮信息。有多种方法可以调用（所以多个msgs），但你需要遵循其中一个

尝试显示消息框时，重载分辨率失败

1 个答案: