public T Execute <T>(Expression expression)
{
//解析表达式，这里的T可能是泛型本身，也可能是集合，或者是动态值
MethodCallExpression methodCall = expression as MethodCallExpression;
Expression <Func <T, bool> > result = null;
while (methodCall != null)
{
Expression method = methodCall.Arguments[0];
Expression lambda = methodCall.Arguments[1];
LambdaExpression right = (lambda as UnaryExpression).Operand as LambdaExpression;
if (result == null)
{
result = Expression.Lambda <Func <T, bool> >(right.Body, right.Parameters);
}
else
{
Expression left = result.Body;
Expression temp = Expression.And(right.Body, left);
result = Expression.Lambda <Func <T, bool> >(temp, result.Parameters);
}
methodCall = method as MethodCallExpression;
}
var cmdText = string.Format("SELECT * FROM {0}", typeof(T).Name);
if (result != null)
{
var resolve = new ResolveExpression(_repository.DataSource);
resolve.ResolveToSql(result);
cmdText = string.Format("{0} WHERE {1}", cmdText, resolve.SqlWhere);
//Command.Parameters.AddRange(resolve.Paras);
//_repository.GetEntity<T>(cmdText,resolve.Paras);
}
//_resolveExpression.ResolveToSql(result);
//var source = new DBSql().FindAs<T>(result);
//var t = _repository.GetEntity<T>(result);
return(default);