合并目录树表达式 And Or Not扩展
using ExpressionDemo.Visitor;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
namespace ExpressionDemo.Extend
{
///
/// 合并表达式 And Or Not扩展
///
public static class ExpressionExtend
{
///
/// 合并表达式 expr1 AND expr2
///
///
///
///
///
public static Expression
{
//return Expression.Lambda
if (expr1 == null)
return expr2;
else if (expr2 == null)
return expr1;
ParameterExpression newParameter = Expression.Parameter(typeof(T), "c");
NewExpressionVisitor visitor = new NewExpressionVisitor(newParameter);
var left = visitor.Replace(expr1.Body);
var right = visitor.Replace(expr2.Body);
var body = Expression.And(left, right);
return Expression.Lambda
}
///
/// 合并表达式 expr1 or expr2
///
///
///
///
///
public static Expression
{
if (expr1 == null)
return expr2;
else if (expr2 == null)
return expr1;
ParameterExpression newParameter = Expression.Parameter(typeof(T), "c");
NewExpressionVisitor visitor = new NewExpressionVisitor(newParameter);
var left = visitor.Replace(expr1.Body);
var right = visitor.Replace(expr2.Body);
var body = Expression.Or(left, right);
return Expression.Lambda
}
public static Expression
{
if (expr == null) return null;
var candidateExpr = expr.Parameters[0];
var body = Expression.Not(expr.Body);
return Expression.Lambda
}
}
}