src/DotNetCommon.Core/ExpressionHelper.cs

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using DotNetCommon.Expressions;
using DotNetCommon.Expressions.Base;
using DotNetCommon.Expressions.Visit;
using DotNetCommon.Extensions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Xml.Linq;

namespace DotNetCommon
{
    /// <summary>
    /// 表达式帮助类
    /// </summary>
    public static class ExpressionHelper
    {
        /// <summary>
        /// 返回lambda表达式树访问到第一个参数的属性名称数组，示例：
        /// <list type="bullet">
        /// <item>
        /// <code>
        /// var cols = ExpressionHelper.GetAccessNames(p => new{ p.Id,p.Name });// 输出: ["Id","Name"]
        /// </code>
        /// </item>
        /// <item>
        /// <code>
        /// var cols = ExpressionHelper.GetAccessNames(p => p.Id);// 输出: ["Id"]
        /// </code>
        /// </item>
        /// <item>
        /// <code>
        /// var cols = ExpressionHelper.GetAccessNames(p => p);// 输出: []
        /// </code>
        /// </item>
        /// <item>
        /// <code>
        /// var cols = ExpressionHelper.GetAccessNames(p => $"id={p.Id},name={p.Name}");// 输出: ["Id","Name"]
        /// </code>
        /// </item>
        /// </list>
        /// </summary>
        /// <param name="lambda"></param>
        /// <returns></returns>
        public static List<string> GetAccessNames(LambdaExpression lambda) => GetAccessMutilNames(lambda).FirstOrDefault();

        /// <summary>
        /// 返回lambda表达式树访问到每个参数的属性名称数组，示例：
        /// <list type="bullet">
        /// <item>
        /// <code>
        /// var cols = ExpressionHelper.GetAccessMutilNames((p1, p2) => new{ p1.Id,p2.Name });// 输出: [["Id"],["Name"]]
        /// </code>
        /// </item>
        /// </list>
        /// </summary>
        /// <param name="lambda"></param>
        /// <remarks>单个参数的输出示例，参考: <seealso cref="ExpressionHelper.GetAccessNames(LambdaExpression)"/></remarks>