我必须计算两个点之间的距离,X和Y是第一个点的坐标,而axisX和axisY是第二个点的坐标。我唯一的线索是这条SQL语句,但是这条SQL没有返回我想要的结果。那么,有没有人能帮我找出我在这句话中可能犯的错误?
string x = "SELECT TownName,Address,SUBSTRING(X, 1, 2) AS Xaxis, SUBSTRING(Y, 1, 2) AS Yaxis,Type,Availability,Price,Size,Bedrooms,Bathrooms,Contact,Screenshot1,Screenshot2,Screenshot3,Scree
谁能给我解释一件事。据我所知,AsParallel()在自己的任务中执行。那么,如果查询返回大量数据,那么当'foreach‘开始执行Console.WriteLine时,变量'd’可以为空?
var integerList = Enumerable.Range(1, 100);
var d = from x in integerList.AsParallel()
where x <= 25
select x;
foreach (var v in d)
{
Console.WriteLine(v);
}
我们刚刚开始学习IO代码,有一点我不理解这个问题:这是服务器代码:
public final class SuccServer {
public static void main(String[] args) {
try (ServerSocket s0 = new ServerSocket(5108);
Socket s = s0.accept();
BufferedReader r =
new BufferedReader(
new InputStreamReader(s.getInputStream(),