public override void Explain(NewArrayExpression exp, Content info)
{
info.IsNewArray();
foreach (var item in exp.Expressions) // 循环解析表达式
{
ExplainTool.Explain(item, info);
}
info.OverNewArray(); // 数组结束
}
public override void Explain(MethodCallExpression exp, Content info)
{
if (ExplainTool.Methods.Contains(exp.Method.Name))
{
if (ExplainTool.MethodLikes.Contains(exp.Method.Name))
{
ExplainTool.Explain(exp.Object, info);
}
ExplainTool.Explain(exp.Arguments[0], info);
info.Append(exp.Method);
if (exp.Arguments.Count > 1)
{
ExplainTool.Explain(exp.Arguments[1], info);
}
}
else
{
info.Append(Expression.Lambda(exp).Compile().DynamicInvoke());
}
}
public override void Explain(MemberExpression exp, Content info)
{
if (exp.Expression != null)
{
if (exp.Expression is ConstantExpression constant)
{
// 如果是变量直接取值
info.Append(constant.Value.GetType().InvokeMember(exp.Member.Name, BindingFlags.GetField, null, constant.Value, null));
}
else
{
ExplainTool.Explain(exp.Expression, info);
info.Append(exp.Member.Name); // 如果树的右边也是个表达式 比如 Join 方法
}
}
else
{
// 目前只有datetime.now之类的右边值会走到这，考虑标记为唯一差异化对待datetime
ExplainTool.Explain(exp.Expression, info);
info.Append(exp.Member);
}
}
public override void Explain(BinaryExpression exp, Content info)
{
ExplainTool.Explain(exp.Left, info);
info.Append(exp.NodeType); // 比较符
ExplainTool.Explain(exp.Right, info); // 树的右边有多种情况
}
public override void Explain(LambdaExpression exp, Content info)
{
ExplainTool.Explain(exp.Body, info);
}
public override void Explain(ListInitExpression exp, Content info)
{
ExplainTool.Explain(exp.NewExpression, info);
}
public override void Explain(UnaryExpression exp, Content info)
{
ExplainTool.Explain(exp.Operand, info);
}