private static string SysExpression_Analyize <T>(SysLE.Expression <Func <T, bool> > exp)
{
StringBuilder builder = new StringBuilder();
SysExpressionWhere_Analyize(exp.Body, builder);
return(builder.ToString());
}
public static Where <T> Where <T>(this From <T> from, SysLE.Expression <Func <T, bool> > expression) where T : class
{
Where <T> where = new Where <T>(default(T));
where.SqlString = from.SqlString + where.ToString() + SysExpression_Analyize(expression);
return(where);
}
public static OrderBy OrderBy <T, TSource>(this From from, SysLE.Expression <Func <T, TSource> > exp)
{
OrderBy orderby = new OrderBy(SysExpression_Analyize <T, TSource>(exp));
orderby.SqlString = from.SqlString + orderby.ToString();
return(orderby);
}
private static string SysExpression_Analyize <T, TSource>(SysLE.Expression <Func <T, TSource> > exp)
{
if (exp.Body.NodeType == SysLE.ExpressionType.Parameter)
{
return(exp.Name);
}
else if (exp.Body.NodeType == SysLE.ExpressionType.MemberAccess)
{
SysLE.MemberExpression mexp = (SysLE.MemberExpression)exp.Body;
if (mexp == null)
{
return(string.Empty);
}
else
{
return(mexp.Member.Name);
}
}
else
{
return(string.Empty);
}
}