/***********************************************************************
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* Project: CoreCms
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* ProjectName: 核心内容管理系统
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* Web: https://www.corecms.net
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* Author: 大灰灰
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* Email: jianweie@163.com
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* CreateTime: 2021/1/31 21:45:10
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* Description: 暂无
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***********************************************************************/
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using System.Collections.Generic;
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using System.Linq.Expressions;
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namespace CoreCms.Net.Model.Entities.Expression
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{
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public class ParameterRebinder : ExpressionVisitor
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{
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private readonly Dictionary<ParameterExpression, ParameterExpression> map;
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public ParameterRebinder(Dictionary<ParameterExpression, ParameterExpression> map)
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{
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this.map = map ?? new Dictionary<ParameterExpression, ParameterExpression>();
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}
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public static System.Linq.Expressions.Expression ReplaceParameters(
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Dictionary<ParameterExpression, ParameterExpression> map, System.Linq.Expressions.Expression exp)
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{
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return new ParameterRebinder(map).Visit(exp);
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}
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protected override System.Linq.Expressions.Expression VisitParameter(ParameterExpression p)
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{
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ParameterExpression replacement;
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if (map.TryGetValue(p, out replacement)) p = replacement;
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return base.VisitParameter(p);
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}
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}
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}
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