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using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace Blog.Core.Common.Extensions
{
public static partial class Extention
{
#region 拓展BuildExtendSelectExpre方法
/// <summary>
/// 组合继承属性选择表达式树,无拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, TResult>> BuildExtendSelectExpre<TBase, TResult>(this Expression<Func<TBase, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,1个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, TResult>> BuildExtendSelectExpre<TBase, T1, TResult>(this Expression<Func<TBase, T1, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,2个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, TResult>> BuildExtendSelectExpre<TBase, T1, T2, TResult>(this Expression<Func<TBase, T1, T2, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,3个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="T3">拓展类型3</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, T3, TResult>> BuildExtendSelectExpre<TBase, T1, T2, T3, TResult>(this Expression<Func<TBase, T1, T2, T3, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, T3, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,4个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="T3">拓展类型3</typeparam>
/// <typeparam name="T4">拓展类型4</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, T3, T4, TResult>> BuildExtendSelectExpre<TBase, T1, T2, T3, T4, TResult>(this Expression<Func<TBase, T1, T2, T3, T4, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, T3, T4, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,5个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="T3">拓展类型3</typeparam>
/// <typeparam name="T4">拓展类型4</typeparam>
/// <typeparam name="T5">拓展类型5</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, T3, T4, T5, TResult>> BuildExtendSelectExpre<TBase, T1, T2, T3, T4, T5, TResult>(this Expression<Func<TBase, T1, T2, T3, T4, T5, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, T3, T4, T5, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,6个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="T3">拓展类型3</typeparam>
/// <typeparam name="T4">拓展类型4</typeparam>
/// <typeparam name="T5">拓展类型5</typeparam>
/// <typeparam name="T6">拓展类型6</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, T3, T4, T5, T6, TResult>> BuildExtendSelectExpre<TBase, T1, T2, T3, T4, T5, T6, TResult>(this Expression<Func<TBase, T1, T2, T3, T4, T5, T6, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, T3, T4, T5, T6, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,7个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="T3">拓展类型3</typeparam>
/// <typeparam name="T4">拓展类型4</typeparam>
/// <typeparam name="T5">拓展类型5</typeparam>
/// <typeparam name="T6">拓展类型6</typeparam>
/// <typeparam name="T7">拓展类型7</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, T3, T4, T5, T6, T7, TResult>> BuildExtendSelectExpre<TBase, T1, T2, T3, T4, T5, T6, T7, TResult>(this Expression<Func<TBase, T1, T2, T3, T4, T5, T6, T7, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, T3, T4, T5, T6, T7, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,8个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="T3">拓展类型3</typeparam>
/// <typeparam name="T4">拓展类型4</typeparam>
/// <typeparam name="T5">拓展类型5</typeparam>
/// <typeparam name="T6">拓展类型6</typeparam>
/// <typeparam name="T7">拓展类型7</typeparam>
/// <typeparam name="T8">拓展类型8</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, T3, T4, T5, T6, T7, T8, TResult>> BuildExtendSelectExpre<TBase, T1, T2, T3, T4, T5, T6, T7, T8, TResult>(this Expression<Func<TBase, T1, T2, T3, T4, T5, T6, T7, T8, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, T3, T4, T5, T6, T7, T8, TResult>>(expression);
}
/// <summary>
/// 组合继承属性选择表达式树,9个拓展参数
/// TResult将继承TBase的所有属性
/// </summary>
/// <typeparam name="TBase">原数据类型</typeparam>
/// <typeparam name="T1">拓展类型1</typeparam>
/// <typeparam name="T2">拓展类型2</typeparam>
/// <typeparam name="T3">拓展类型3</typeparam>
/// <typeparam name="T4">拓展类型4</typeparam>
/// <typeparam name="T5">拓展类型5</typeparam>
/// <typeparam name="T6">拓展类型6</typeparam>
/// <typeparam name="T7">拓展类型7</typeparam>
/// <typeparam name="T8">拓展类型8</typeparam>
/// <typeparam name="T9">拓展类型9</typeparam>
/// <typeparam name="TResult">返回类型</typeparam>
/// <param name="expression">拓展表达式</param>
/// <returns></returns>
public static Expression<Func<TBase, T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>> BuildExtendSelectExpre<TBase, T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>(this Expression<Func<TBase, T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>> expression) where TResult : TBase
{
return GetExtendSelectExpre<TBase, TResult, Func<TBase, T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>>(expression);
}
#endregion
#region 拓展And和Or方法
/// <summary>
/// 连接表达式与运算
/// </summary>
/// <typeparam name="T">参数</typeparam>
/// <param name="one">原表达式</param>
/// <param name="another">新的表达式</param>
/// <returns></returns>
public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> one, Expression<Func<T, bool>> another)
{
//创建新参数
var newParameter = Expression.Parameter(typeof(T), "parameter");
var parameterReplacer = new ParameterReplaceVisitor(newParameter);
var left = parameterReplacer.Visit(one.Body);
var right = parameterReplacer.Visit(another.Body);
var body = Expression.And(left, right);
return Expression.Lambda<Func<T, bool>>(body, newParameter);
}
/// <summary>
/// 连接表达式或运算
/// </summary>
/// <typeparam name="T">参数</typeparam>
/// <param name="one">原表达式</param>
/// <param name="another">新表达式</param>
/// <returns></returns>
public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> one, Expression<Func<T, bool>> another)
{
//创建新参数
var newParameter = Expression.Parameter(typeof(T), "parameter");
var parameterReplacer = new ParameterReplaceVisitor(newParameter);
var left = parameterReplacer.Visit(one.Body);
var right = parameterReplacer.Visit(another.Body);
var body = Expression.Or(left, right);
return Expression.Lambda<Func<T, bool>>(body, newParameter);
}
#endregion
#region 拓展Expression的Invoke方法
public static TResult Invoke<TResult>(this Expression<Func<TResult>> expression)
{
return expression.Compile().Invoke();
}
public static TResult Invoke<T1, TResult>(this Expression<Func<T1, TResult>> expression, T1 arg1)
{
return expression.Compile().Invoke(arg1);
}
public static TResult Invoke<T1, T2, TResult>(this Expression<Func<T1, T2, TResult>> expression, T1 arg1, T2 arg2)
{
return expression.Compile().Invoke(arg1, arg2);
}
public static TResult Invoke<T1, T2, T3, TResult>(this Expression<Func<T1, T2, T3, TResult>> expression, T1 arg1, T2 arg2, T3 arg3)
{
return expression.Compile().Invoke(arg1, arg2, arg3);
}
public static TResult Invoke<T1, T2, T3, T4, TResult>(this Expression<Func<T1, T2, T3, T4, TResult>> expression, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
{
return expression.Compile().Invoke(arg1, arg2, arg3, arg4);
}
public static TResult Invoke<T1, T2, T3, T4, T5, TResult>(this Expression<Func<T1, T2, T3, T4, T5, TResult>> expression, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5)
{
return expression.Compile().Invoke(arg1, arg2, arg3, arg4, arg5);
}
public static TResult Invoke<T1, T2, T3, T4, T5, T6, TResult>(this Expression<Func<T1, T2, T3, T4, T5, T6, TResult>> expression, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6)
{
return expression.Compile().Invoke(arg1, arg2, arg3, arg4, arg5, arg6);
}
public static TResult Invoke<T1, T2, T3, T4, T5, T6, T7, TResult>(this Expression<Func<T1, T2, T3, T4, T5, T6, T7, TResult>> expression, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7)
{
return expression.Compile().Invoke(arg1, arg2, arg3, arg4, arg5, arg6, arg7);
}
public static TResult Invoke<T1, T2, T3, T4, T5, T6, T7, T8, TResult>(this Expression<Func<T1, T2, T3, T4, T5, T6, T7, T8, TResult>> expression, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8)
{
return expression.Compile().Invoke(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
}
public static TResult Invoke<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>(this Expression<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>> expression, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9)
{
return expression.Compile().Invoke(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9);
}
public static TResult Invoke<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>(this Expression<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>> expression, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10)
{
return expression.Compile().Invoke(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
}
#endregion
/// <summary>
/// 获取表达式中的固定值
/// </summary>
/// <param name="expression">表达式</param>
/// <returns></returns>
public static object GetConstantValue(this Expression expression)
{
var visitor = new GetConstantValueVisitor();
visitor.Visit(expression);
return visitor.ConstantValue;
}
public static object GetMemberValue(this Expression expression)
{
var visitor = new GetMemberValueVisitor();
visitor.Visit(expression);
return visitor.Value;
}
#region 私有成员
private static Expression<TDelegate> GetExtendSelectExpre<TBase, TResult, TDelegate>(Expression<TDelegate> expression)
{
NewExpression newBody = Expression.New(typeof(TResult));
MemberInitExpression oldExpression = (MemberInitExpression)expression.Body;
ParameterExpression[] oldParamters = expression.Parameters.ToArray();
List<string> existsProperties = new List<string>();
foreach (var aBinding in oldExpression.Bindings)
{
existsProperties.Add(aBinding.Member.Name);
}
List<MemberBinding> newBindings = new List<MemberBinding>();
var ls = typeof(TResult).GetProperties().Where(x => !existsProperties.Contains(x.Name));
foreach (var aProperty in ls)
{
if (typeof(TBase).GetMembers().Any(x => x.Name == aProperty.Name))
{
MemberInfo newMember = typeof(TBase).GetMember(aProperty.Name)[0];
MemberBinding newMemberBinding = Expression.Bind(newMember, Expression.Property(oldParamters[0], aProperty.Name));
newBindings.Add(newMemberBinding);
}
}
newBindings.AddRange(oldExpression.Bindings);
var body = Expression.MemberInit(newBody, newBindings.ToArray());
var resExpression = Expression.Lambda<TDelegate>(body, oldParamters);
return resExpression;
}
#endregion
}
/// <summary>
/// 继承ExpressionVisitor类，实现参数替换统一
/// </summary>
class ParameterReplaceVisitor : ExpressionVisitor
{
public ParameterReplaceVisitor(ParameterExpression paramExpr)
{
_parameter = paramExpr;
}
//新的表达式参数
private ParameterExpression _parameter { get; set; }
protected override Expression VisitParameter(ParameterExpression p)
{
if (p.Type == _parameter.Type)
return _parameter;
else
return p;
}
}
class GetConstantValueVisitor : ExpressionVisitor
{
public object ConstantValue { get; set; }
protected override Expression VisitConstant(ConstantExpression node)
{
ConstantValue = node.Value;
return base.VisitConstant(node);
}
}
class GetMemberValueVisitor : ExpressionVisitor
{
public object Value { get; set; }
}
}