IEnumerator IEnumerable.GetEnumerator()
{
string url = PostHelper.BuildUrl(_criteria);
IEnumerable <Post> posts = PostHelper.PerformWebQuery(url);
return(posts.GetEnumerator());
}
public override object Execute(Expression expression)
{
var url = GetQueryText(expression);
var results = PostHelper.PerformWebQuery(url);
return(results);
}
public override string GetQueryText(Expression expression)
{
// 翻译查询条件
var criteria = new PostExpressionVisitor().ProcessExpression(expression);
// 生成URL
return(PostHelper.BuildUrl(criteria));
}