/// <summary>
///
/// </summary>
/// <param name="expr"></param>
/// <param name="callExpression"></param>
/// <returns></returns>
internal static bool TryMatchLocalExpression(Expression expr, out MethodCallExpression callExpression)
{
bool result;
try
{
LocalDMSExpressionChecker localExpressionChecker = new LocalDMSExpressionChecker();
Expression exprCopy = localExpressionChecker.Visit(expr);
result = localExpressionChecker._foundSpecialMethod;
if (result)
{
callExpression = exprCopy as MethodCallExpression;
}
else
{
callExpression = null;
}
}
catch (Exception arg)
{
Console.WriteLine("TryMatchLocalExpression failed: " + arg);
throw;
}
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="expr"></param>
/// <param name="funcReturningObj"></param>
/// <returns></returns>
internal static bool TryMatchLocalExpression(Expression expr, out FunctionReturningObject funcReturningObj)
{
bool result;
try
{
LocalDMSExpressionChecker localExpressionChecker = new LocalDMSExpressionChecker();
localExpressionChecker.Visit(expr);
bool flag = !localExpressionChecker._foundParameter && !localExpressionChecker._foundSpecialMethod && localExpressionChecker._foundConstant;
if (flag)
{
funcReturningObj = LocalDMSExpressionChecker.CompileLocalExpression(expr);
}
else
{
funcReturningObj = null;
}
result = flag;
}
catch (Exception arg)
{
System.Diagnostics.Debug.WriteLine("TryMatchLocalExpression failed: " + arg);
throw;
}
return(result);
}
/// <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));
}
internal static ConstantExpression ConvertConstantExpression(Expression expr)
{
FunctionReturningObject functionReturningObject = LocalDMSExpressionChecker.CompileLocalExpression(expr);
return(Expression.Constant(functionReturningObject(), expr.Type));
}
