本文整理汇总了VB.NET中System.Linq.Expressions.Expression.AddAssign方法的典型用法代码示例。如果您正苦于以下问题：VB.NET Expression.AddAssign方法的具体用法？VB.NET Expression.AddAssign怎么用？VB.NET Expression.AddAssign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.AddAssign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: ParameterExpression
' Add the following directive to your file:
' Imports System.Linq.Expressions
' The parameter expression is used to create a variable.
Dim variableExpr As ParameterExpression = Expression.Variable(GetType(Integer), "sampleVar")
' The block expression enables you to execute several expressions sequentually.
' In this block, the variable is first initialized with 1.
' Then the AddAssign method adds 2 to the variable and assigns the result to the variable.
Dim addAssignExpr As BlockExpression = Expression.Block(
New ParameterExpression() {variableExpr},
Expression.Assign(variableExpr, Expression.Constant(1)),
Expression.AddAssign(
variableExpr,
Expression.Constant(2)
)
)
' Print the expression from the block expression.
Console.WriteLine("The expressions from the block expression:")
For Each expr As Expression In addAssignExpr.Expressions
Console.WriteLine(expr.ToString())
Next
Console.WriteLine("The result of executing the expression tree:")
' The following statement first creates an expression tree,
' then compiles it, and then executes it.
Console.WriteLine(Expression.Lambda(Of Func(Of Integer))(addAssignExpr).Compile()())输出：
The expressions from the block expression: (sampleVar = 1) (sampleVar += 2) The result of executing the expression tree: 3