本文整理汇总了VB.NET中System.Data.Odbc.OdbcConnectionStringBuilder.TryGetValue方法的典型用法代码示例。如果您正苦于以下问题：VB.NET OdbcConnectionStringBuilder.TryGetValue方法的具体用法？VB.NET OdbcConnectionStringBuilder.TryGetValue怎么用？VB.NET OdbcConnectionStringBuilder.TryGetValue使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.Odbc.OdbcConnectionStringBuilder的用法示例。
在下文中一共展示了OdbcConnectionStringBuilder.TryGetValue方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: Module1
' 导入命名空间
Imports System.Data.Odbc
Module Module1
Sub Main()
Dim builder As New OdbcConnectionStringBuilder
builder.ConnectionString = GetConnectionString()
' Call TryGetValue method for multiple
' key names. Demonstrate that the search is not
' case sensitive.
DisplayValue(builder, "Driver")
DisplayValue(builder, "SERVER")
' How about a property you did not set?
DisplayValue(builder, "DNS")
' Invalid keys?
DisplayValue(builder, "Invalid Key")
' Null values?
DisplayValue(builder, Nothing)
Console.WriteLine("Press any key to continue.")
Console.ReadLine()
End Sub
Private Sub DisplayValue( _
ByVal builder As OdbcConnectionStringBuilder, ByVal key As String)
Dim value As Object = Nothing
' Although TryGetValue handles missing keys,
' it does not handle passing in a null (Nothing in Visual Basic)
' key. This example traps for that particular error, but
' throws any other unknown exceptions back out to the
' caller.
Try
If builder.TryGetValue(key, value) Then
Console.WriteLine("{0}='{1}'", key, value)
Else
Console.WriteLine("Unable to retrieve value for '{0}'", key)
End If
Catch ex As ArgumentNullException
Console.WriteLine("Unable to retrieve value for null key.")
End Try
End Sub
Private Function GetConnectionString() As String
' To avoid storing the connection string in your code,
' you can retrieve it from a configuration file using the
' System.Configuration.ConfigurationSettings.AppSettings property.
Return "Driver={SQL Server};Server=(local);" & _
"Database=AdventureWorks;Trusted_Connection=yes;"
End Function
End Module