public static void SetUnionIndex <T>(string indexName, List <string> fields, Attribute.FieldIndexType fieldIndexType)
{
indexName = string.Format("{0}_{1}", typeof(T).Name, indexName);
var indexs = getTableIndex <T>();
if (indexs.UnionIndex.ContainsKey(indexName))
{
return;
}
var unionIndexItem = new UnionIndexItem()
{
FieldIndexType = fieldIndexType
};
for (int i = 0; i < fields.Count(); i++)
{
var field = fields[i];
if (unionIndexItem.Fields.Contains(field))
{
throw new Exception("联合索引 " + indexName + " 中已包括字段" + field);
}
unionIndexItem.Fields.Add(field);
}
indexs.UnionIndex.TryAdd(indexName, unionIndexItem);
}
/// <summary>
/// 设置联合索引
/// </summary>
/// <typeparam name="Tresult"></typeparam>
/// <param name="indexName"></param>
/// <param name="expression"></param>
/// <returns></returns>
public PropertyBuilder <T> AsUnionIndex <Tresult>(string indexName, Expression <Func <T, Tresult> > expression)
{
if (string.IsNullOrEmpty(indexName))
{
throw new Exception("索引名称是必须的 indexName");
}
var type = typeof(T);
var newExpression = expression.Body as NewExpression;
if (newExpression == null)
{
throw new Exception("必须为匿名表达式");
}
indexName = string.Format("{0}_{1}", typeof(T).Name, indexName);
if (indexs.UnionIndex.ContainsKey(indexName))
{
return(this);
}
var unionIndexItem = new UnionIndexItem();
for (int i = 0; i < newExpression.Arguments.Count(); i++)
{
var item = newExpression.Arguments[i];
MemberExpression m;
if (item is UnaryExpression)
{
var uExp = item as UnaryExpression;
m = uExp.Operand as MemberExpression;
}
else
{
m = item as MemberExpression;
}
if (m == null)
{
throw new Exception(item + "不为MemberExpression");
}
if (unionIndexItem.Fields.Contains(m.Member.Name))
{
throw new Exception("联合索引 " + indexName + " 中已包括字段" + m.Member.Name);
}
unionIndexItem.Fields.Add(m.Member.Name);
}
indexs.UnionIndex.TryAdd(indexName, unionIndexItem);
return(this);
}