c# 避免重复读取数组中的字符串

[认真学编程]

有数组string[] arr1 ={"T123","D234","T2345","W123456","D456788","F23566"}和数组string[] arr2={"T","D","W"},如果arr1中的字符串包含arr2中的字符串，则读出该字符串，但只读出arr1中第一个含有arr2中字符串的字符串，即只读出"T123","D234","W123456"这3个字符串，请问这个功能要怎么实现啊，请教啦

[testtestett]

最笨的方法，两个循环遍历输出

[LingXX0103]

如果是arr2作为主循环 找到跳出循环 不会有重复

如果不放心
说一个思路
如果用arr2中找到了(indexof) 则把arr2中这个元素清空 那么下次永远也找不到
就不会重复了

[yzxdc]

ArrayList result = new ArrayList();
foreach(string s1 in arr1)
    foreach(string s2 in arr2)
        if(s1.IndexOf(s2) >= 0)
        {
            result.add(s1);
            arr2.Remove(s2); 
            break;
        }
 

[lhm741cs]

直接双循环
remove()移除已遍历的就可以
最简单，最笨的方法

[wangkun9999]

典型的查找算法,如果字符串比较大的话,主要看效率的问题
参考

[weike021996]

[Quote=引用 3 楼 yzxdc 的回复:]
C# code

ArrayList result = new ArrayList();
foreach(string s1 in arr1)
foreach(string s2 in arr2)
if(s1.IndexOf(s2) >= 0)
{
result.add(s1);
arr2.Re……
[/Quote]
mark

[兔子-顾问]

private static void TestSearch01()
{
    string[] arr1 = { "T123", "D234", "T2345", "W123456", "D456788", "F23566" };
    string[] arr2 = { "T", "D", "W" };
    string search = string.Empty;
    foreach (string s in arr2) search += s;
    string[] arr = (from s in arr1 where search.Contains(s.Substring(0, 1)) orderby s.Substring(0, 1) select s).ToArray();
    foreach (string s in arr)
    {
        Console.WriteLine(s);
    }
}

[兔子-顾问]

简化一下：

private static void TestSearch01()
{
    string[] arr1 = { "T123", "D234", "T2345", "W123456", "D456788", "F23566" };
    string[] arr2 = { "T", "D", "W" };
    string search = string.Empty;
    foreach (string s in arr2) search += s;
    string[] arr = (from s in arr1 where search.Contains(s[0]) orderby s select s).ToArray();
    foreach (string s in arr)
    {
        Console.WriteLine(s);
    }
}

[testtestett]

[Quote=引用 8 楼 wuyazhe 的回复:]

简化一下：
C# code
private static void TestSearch01()
{
string[] arr1 = { "T123", "D234", "T2345", "W123456", "D456788", "F23566" };
string[] arr2 = { "T", "D", "W" };
string search = string……
[/Quote]

s[0]。。。只是第一个字符吗？

[兔子-顾问]

是的。

[deknight]

Dictionary<string, string> myDic = new Dictionary<string, string>();
myDic.Add("aaa", "111");
myDic.Add("bbb", "222");
myDic.Add("ccc", "333");
myDic.Add("ddd", "444");
//如果添加已经存在的键，add方法会抛出异常
try
{
myDic.Add("ddd","ddd");
}
catch (ArgumentException ex)
{
Console.WriteLine("此键已经存在：" + ex.Message);
}
//解决add()异常的方法是用ContainsKey()方法来判断键是否存在
if (!myDic.ContainsKey("ddd"))
{
myDic.Add("ddd", "ddd");
}
else
{
Console.WriteLine("此键已经存在：");

}

[修改一下昵称]

string[] vars = new string[] { "T123", "D234", "T2345", "W123456", "D456788", "F23566" };
        string[] vars2 = new string[] { "T", "D", "W" };

        var query1 = from val in vars where vars2.Contains(val.Substring(0, 1)) orderby val select val;
        
        
        foreach (var item in query1)
        {

            Response.Write(item + "<br>");
        }

[兔子-顾问]

崇拜的目光投向yhb417。linq

[zhoubupt]

yhb417的写法都没用过，差距啊

[deknight]

同上 复内容太短了！

[testtestett]

感觉linq就是语法糖

[tanxiaowei]

学习学习。