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159
CkTools/Src/CkTools.BaseExtensions/Helper/ExpressionHelper.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Linq.Expressions; | ||
|
|
||
| namespace CkTools.Helper | ||
| { | ||
| /// <summary> | ||
| /// 表达式帮助类 | ||
| /// </summary> | ||
| public static class ExpressionHelper | ||
| { | ||
| /// <summary> | ||
| /// 创建一个访问属性的表达式 | ||
| /// </summary> | ||
| /// <param name="expression">表达式</param> | ||
| /// <param name="propertyName">属性名称</param> | ||
| /// <returns></returns> | ||
| public static Expression Property(this Expression expression, string propertyName) | ||
| { | ||
| return Expression.Property(expression, propertyName); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// 条件表达式且（第一个true才执行第二个） | ||
| /// </summary> | ||
| /// <param name="left">左表达式</param> | ||
| /// <param name="right">右表达式</param> | ||
| /// <returns></returns> | ||
| public static Expression AndAlso(this Expression left, Expression right) | ||
| { | ||
| return Expression.AndAlso(left, right); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// 创建一个回调带有参数方法的表达式 | ||
| /// </summary> | ||
| /// <param name="instance">表达式</param> | ||
| /// <param name="methodName">方法名字</param> | ||
| /// <param name="arguments">参数</param> | ||
| /// <returns></returns> | ||
| public static Expression Call(this Expression instance, string methodName, params Expression[] arguments) | ||
| { | ||
| return Expression.Call(instance, instance.Type.GetMethod(methodName), arguments); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// 创建一个比较表达式 | ||
| /// </summary> | ||
| /// <param name="left">左表达式</param> | ||
| /// <param name="right">右表达式</param> | ||
| /// <returns></returns> | ||
| public static Expression GreaterThan(this Expression left, Expression right) | ||
| { | ||
| return Expression.GreaterThan(left, right); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Lambda表达式 | ||
| /// </summary> | ||
| /// <typeparam name="T">类型</typeparam> | ||
| /// <param name="body">表达式</param> | ||
| /// <param name="parameters">参数</param> | ||
| /// <returns></returns> | ||
| public static Expression<T> ToLambda<T>(this Expression body, params ParameterExpression[] parameters) | ||
| { | ||
| return Expression.Lambda<T>(body, parameters); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Lambda(真) | ||
| /// </summary> | ||
| /// <typeparam name="T">类型</typeparam> | ||
| /// <returns></returns> | ||
| public static Expression<Func<T, bool>> True<T>() { return param => true; } | ||
|
|
||
| /// <summary> | ||
| /// Lambda（假） | ||
| /// </summary> | ||
| /// <typeparam name="T">类型</typeparam> | ||
| /// <returns></returns> | ||
| public static Expression<Func<T, bool>> False<T>() { return param => false; } | ||
|
|
||
| /// <summary> | ||
| /// 组合And | ||
| /// </summary> | ||
| /// <returns></returns> | ||
| public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second) | ||
| { | ||
| return first.Compose(second, Expression.AndAlso); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// 组合Or | ||
| /// </summary> | ||
| /// <returns></returns> | ||
| public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second) | ||
| { | ||
| return first.Compose(second, Expression.OrElse); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Combines the first expression with the second using the specified merge function. | ||
| /// </summary> | ||
| private static Expression<T> Compose<T>(this Expression<T> first, Expression<T> second, Func<Expression, Expression, Expression> merge) | ||
| { | ||
| var map = first.Parameters | ||
| .Select((f, i) => new { f, s = second.Parameters[i] }) | ||
| .ToDictionary(p => p.s, p => p.f); | ||
| var secondBody = ParameterRebinder.ReplaceParameters(map, second.Body); | ||
| return Expression.Lambda<T>(merge(first.Body, secondBody), first.Parameters); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// ParameterRebinder | ||
| /// </summary> | ||
| private class ParameterRebinder : ExpressionVisitor | ||
| { | ||
| /// <summary> | ||
| /// The ParameterExpression map | ||
| /// </summary> | ||
| private readonly Dictionary<ParameterExpression, ParameterExpression> map; | ||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="ParameterRebinder"/> class. | ||
| /// </summary> | ||
| /// <param name="map">The map.</param> | ||
| private ParameterRebinder(Dictionary<ParameterExpression, ParameterExpression> map) | ||
| { | ||
| this.map = map ?? new Dictionary<ParameterExpression, ParameterExpression>(); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Replaces the parameters. | ||
| /// </summary> | ||
| /// <param name="map">The map.</param> | ||
| /// <param name="exp">The exp.</param> | ||
| /// <returns>Expression</returns> | ||
| public static Expression ReplaceParameters(Dictionary<ParameterExpression, ParameterExpression> map, Expression exp) | ||
| { | ||
| return new ParameterRebinder(map).Visit(exp); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Visits the parameter. | ||
| /// </summary> | ||
| /// <param name="p">The p.</param> | ||
| /// <returns>Expression</returns> | ||
| protected override Expression VisitParameter(ParameterExpression p) | ||
| { | ||
| if (map.TryGetValue(p, out ParameterExpression replacement)) | ||
| { | ||
| p = replacement; | ||
| } | ||
| return base.VisitParameter(p); | ||
| } | ||
| } | ||
| } | ||
| } |
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