LambdaToSql/LambdaParser/ExpressionTypeCast.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;

namespace LambdaToSql.LambdaParser
{
    internal class ExpressionTypeCast
    {
        #region ExpressionTypeCast 类型转换

        /// <summary>
        /// 类型转换
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        internal static string Convert(ExpressionType type)
        {
            switch (type)
            {
                case ExpressionType.And:
                case ExpressionType.AndAlso:
                    return " and ";
                case ExpressionType.Equal:
                    return " =";
                case ExpressionType.GreaterThan:
                    return " >";
                case ExpressionType.GreaterThanOrEqual:
                    return ">=";
                case ExpressionType.LessThan:
                    return "<";
                case ExpressionType.LessThanOrEqual:
                    return "<=";
                case ExpressionType.NotEqual:
                    return "<>";
                case ExpressionType.Or:
                case ExpressionType.OrElse:
                    return " or ";
                case ExpressionType.Add:
                case ExpressionType.AddChecked:
                    return "+";
                case ExpressionType.Subtract:
                case ExpressionType.SubtractChecked:
                    return "-";
                case ExpressionType.Divide:
                    return "/";
                case ExpressionType.Multiply:
                case ExpressionType.MultiplyChecked:
                    return "*";
                default:
                    return null;
            }
        }
        #endregion
    }
}