/// <summary>
 /// 创建小于等于运算表达式
 /// </summary>
 /// <param name="left">左操作数</param>
 /// <param name="value">值</param>
 public static Expression LessEqual(this Expression left, object value) => left.LessEqual(Lambdas.Constant(value, left));
 /// <summary>
 /// 创建大于运算表达式
 /// </summary>
 /// <param name="left">左操作数</param>
 /// <param name="value">值</param>
 public static Expression Greater(this Expression left, object value) => left.Greater(Lambdas.Constant(value, left));