private static GroupByClip ToGroupByClipChild(System.Linq.Expressions.Expression exprBody)
{
if (exprBody is MemberExpression)
{
var e = (MemberExpression)exprBody;
return(new GroupByClip(new Field(e.Member.Name, e.Expression.Type.Name)));
}
if (exprBody is NewExpression)
{
var exNew = (NewExpression)exprBody;
var type = exNew.Constructor.DeclaringType;
var list = new List <string>(exNew.Arguments.Count);
GroupByClip gb = GroupByClip.None;
foreach (MemberExpression member in exNew.Arguments)
{
gb = gb && new Field(member.Member.Name, member.Expression.Type.Name).GroupBy;
}
return(gb);
}
if (exprBody is UnaryExpression)
{
var exNew = (UnaryExpression)exprBody;
return(ToGroupByClipChild(exNew.Operand));
//var type = exNew.Constructor.DeclaringType;
//var list = new List<string>(exNew.Arguments.Count);
//GroupByClip gb = GroupByClip.None;
//foreach (MemberExpression member in exNew.Arguments)
//{
// gb = gb && new Field(member.Member.Name, member.Expression.Type.Name).GroupBy;
//}
//return gb;
}
throw new Exception("暂时不支持的Group by lambda写法！请使用经典写法！");
}
/// <summary>
/// 去掉的表前缀
/// </summary>
/// <returns></returns>
public GroupByClip RemovePrefixTableName()
{
GroupByClip groupc = new GroupByClip(this.groupByClip);
if (string.IsNullOrEmpty(groupc.groupByClip))
return groupc;
StringBuilder gstring = new StringBuilder();
string[] fs = groupc.groupByClip.Split(',');
foreach (string s in fs)
{
if (string.IsNullOrEmpty(s))
continue;
gstring.Append(",");
if (s.IndexOf('.') > 0)
gstring.Append(s.Substring(s.IndexOf('.') + 1));
else
gstring.Append(s);
}
if (gstring.Length > 1)
groupc.groupByClip = gstring.ToString().Substring(1);
else
groupc.groupByClip = gstring.ToString();
return groupc;
}
/// <summary>
/// 判断 GroupByClip 是否为null
/// </summary>
/// <param name="groupByClip"></param>
/// <returns></returns>
public static bool IsNullOrEmpty(GroupByClip groupByClip)
{
if ((null == groupByClip) || string.IsNullOrEmpty(groupByClip.ToString()))
{
return(true);
}
return(false);
}
/// <summary>
/// 比较
/// </summary>
/// <param name="groupByClip"></param>
/// <returns></returns>
public bool Equals(GroupByClip groupByClip)
{
if (null == groupByClip)
{
return(false);
}
return(this.ToString().Equals(groupByClip.ToString()));
}
/// <summary>
/// 去掉的表前缀
/// </summary>
/// <returns></returns>
public GroupByClip RemovePrefixTableName()
{
GroupByClip groupc = new GroupByClip(this.groupByClip);
if (string.IsNullOrEmpty(groupc.groupByClip))
{
return(groupc);
}
StringBuilder gstring = new StringBuilder();
string[] fs = groupc.groupByClip.Split(',');
foreach (string s in fs)
{
if (string.IsNullOrEmpty(s))
{
continue;
}
gstring.Append(",");
if (s.IndexOf('.') > 0)
{
gstring.Append(s.Substring(s.IndexOf('.') + 1));
}
else
{
gstring.Append(s);
}
}
if (gstring.Length > 1)
{
groupc.groupByClip = gstring.ToString().Substring(1);
}
else
{
groupc.groupByClip = gstring.ToString();
}
return(groupc);
}
/// <summary>
/// 判断 GroupByClip 是否为null
/// </summary>
/// <param name="groupByClip"></param>
/// <returns></returns>
public static bool IsNullOrEmpty(GroupByClip groupByClip)
{
if ((null == groupByClip) || string.IsNullOrEmpty(groupByClip.ToString()))
return true;
return false;
}
/// <summary>
/// 比较
/// </summary>
/// <param name="groupByClip"></param>
/// <returns></returns>
public bool Equals(GroupByClip groupByClip)
{
if (null == groupByClip)
return false;
return this.ToString().Equals(groupByClip.ToString());
}
