本文整理汇总了VB.NET中System.Linq.Expressions.Expression.Constant方法的典型用法代码示例。如果您正苦于以下问题：VB.NET Expression.Constant方法的具体用法？VB.NET Expression.Constant怎么用？VB.NET Expression.Constant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.Linq.Expressions.Expression的用法示例。
在下文中一共展示了Expression.Constant方法的2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:
' Add the following directive to your file:
' Imports System.Linq.Expressions
' This expression represents a constant value.
Dim constantExpr As Expression = Expression.Constant(5.5)
' Print the expression.
Console.WriteLine(constantExpr.ToString())
' You can also use variables.
Dim num As Double = 3.5
constantExpr = Expression.Constant(num)
Console.WriteLine(constantExpr.ToString())输出：
5.5 3.5
示例2: GetType
' Add the following directive to your file:
' Imports System.Linq.Expressions
' This expression represents a constant value,
' for which you can explicitly specify the type.
' This can be used, for example, for defining constants of a nullable type.
Dim constantExpr As Expression = Expression.Constant(
Nothing,
GetType(Double?)
)
' Print the expression.
Console.WriteLine(constantExpr.ToString())输出：
null