希望一切顺利。
我在这里遇到一个简单的问题。我正在尝试创建一个控制台应用程序,允许您搜索列表中的单词(通过一个或多个字符,即u =用户,用户组)。
我似乎无法克服这个错误: 错误CS0305使用通用类型'列表'需要1个类型参数wordSearch c:\ Projects \ wordSearch \ wordSearch \ Program.cs 36 Active
请在下面找到我的代码.....欢迎任何帮助提前谢谢。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace wordSearch
{
public class MyList<T> { }
public class TestList<T> { }
class MyList
{
public static void Main()
{
string searchKeyword = "o";
List<string> items = new List<string>();
items.Add("User");
items.Add("User Groups");
items.Add("User Activity Log");
items.Add("Report Designer");
items.Add("Report Activity Log");
List<string> searchResults = items.FindAll(u =>
u.Contains(searchKeyword));
Console.WriteLine("Please type in the first letter of item you
are looking for:");
Console.ReadLine();
foreach (var result in System.Collections.Generic.List.Where(u =>
u.IndexOf(mySearchString) == 0))
{
Console.WriteLine("User, User Groups, User Activity Log");
Console.ReadKey();
}
foreach (var result in List.Where(r => r.IndexOf(mySearchString) ==
0))
{
Console.WriteLine("Report Desinger, Report Activity Log");
Console.ReadKey();
}
}
}
}
答案 0 :(得分:3)
您的代码存在两个问题:
mySearchString
中。items
实例,而不是System.Collections.Generic.ListList
类型:你可以这样说:
...
Console.WriteLine("Please type in the first letter of item you are looking for:");
//DONE: user input saved
string mySearchString = Console.ReadLine();
//DONE: we scan items, not List
foreach (var result in items.Where(u => u.IndexOf(mySearchString) == 0)) {
Console.WriteLine("User, User Groups, User Activity Log");
Console.ReadKey();
}
// DONE: we scan items not List
foreach (var result in items.Where(r => r.IndexOf(mySearchString) == 0)) {
Console.WriteLine("Report Desinger, Report Activity Log");
Console.ReadKey();
}
...
编辑:似乎实际的请求是在循环中查询列表,foreach
而不是复制粘贴,如下所示:
public static void Main() {
List<string> items = new List<string>() {
"User",
"User Groups",
"User Activity Log",
"Report Designer",
"Report Activity Log",
}
while (true) {
Console.WriteLine("Please type in the first letter of item you are looking for:");
Console.WriteLine("Prease press enter (i.e. type an empty string) to quit");
string mySearchString = Console.ReadLine();
if (string.IsNullOrEmpty(mySearchString))
break;
foreach (var item in items.Where(r => r.IndexOf(mySearchString) == 0))
Console.WriteLine(item);
Console.WriteLine();
}
}