/// <summary>
/// 重载访问UnaryExpression
/// </summary>
/// <param name="u"></param>
/// <returns></returns>
protected override Expression VisitUnary(UnaryExpression u)
{
ConstantExpression result;
if (LocalDMSExpressionChecker.TryMatchLocalExpression(u, out result))
{
return(result);
}
return(base.VisitUnary(u));
}
/// <summary>
/// 重载访问NewArrayExpression
/// </summary>
/// <param name="na"></param>
/// <returns></returns>
protected override Expression VisitNewArray(NewArrayExpression na)
{
ConstantExpression result;
if (LocalDMSExpressionChecker.TryMatchLocalExpression(na, out result))
{
return(result);
}
return(base.VisitNewArray(na));
}
/// <summary>
///
/// </summary>
/// <param name="expr"></param>
/// <param name="constExpr"></param>
/// <returns></returns>
internal static bool TryMatchLocalExpression(Expression expr, out ConstantExpression constExpr)
{
FunctionReturningObject functionReturningObject;
if (LocalDMSExpressionChecker.TryMatchLocalExpression(expr, out functionReturningObject))
{
constExpr = Expression.Constant(functionReturningObject(), expr.Type);
return(true);
}
constExpr = null;
return(false);
}
/// <summary>
/// 重载访问MemberExpression
/// </summary>
/// <param name="m"></param>
/// <returns></returns>
protected override Expression VisitMemberAccess(MemberExpression m)
{
ConstantExpression result;
if (m != null && m.Expression == null)
{
result = LocalDMSExpressionChecker.ConvertConstantExpression(m);
return(result);
}
if (LocalDMSExpressionChecker.TryMatchLocalExpression(m, out result))
{
return(result);
}
return(base.VisitMemberAccess(m));
}
/// <summary>
/// 重载访问MethodCallExpression
/// </summary>
/// <param name="m"></param>
/// <returns></returns>
protected override Expression VisitMethodCall(MethodCallExpression m)
{
ConstantExpression result;
if (LocalDMSExpressionChecker.TryMatchLocalExpression(m, out result))
{
return(result);
}
MethodCallExpression mResult; //子查询处理器
if (LocalDMSExpressionChecker.TryMatchLocalExpression(m, out mResult))
{
return(mResult);
}
return(base.VisitMethodCall(m));
}