C# 字典找不到字符串键
本文关键字:字符串 找不到 字典 | 更新日期: 2023-09-27 17:56:32
我快疯了吗?为什么这会返回异常!?为什么找不到钥匙?它显然在那里!
public class Spanning {
Dictionary<string, City> graph = new Dictionary<string, City>();
public static void Main(string[] args) {
new Spanning().Parse("file.in");
}
public void Parse(string f) {
string[] citySeparator = new string[] {"--"};
using (StreamReader reader = new StreamReader(f)) {
string line;
while((line = reader.ReadLine()) != null) {
if (!line.Contains("--")) {
graph[line] = new City {name = line.Substring(0, line.Length - 1)};
} else {
string[] split = line.Split(citySeparator, StringSplitOptions.None);
City city1 = graph[split[0]];
}
}
}
}
class City {
Dictionary<City, int> links = new Dictionary<City, int>();
public string name;
public override string ToString() {
return name;
}
}
}
输入文件仅包含两行:
"San Diego"
"San Diego"--"San Antonio" [1319]
文件的第一行
"San Diego"
在最后一个"
和换行符之间具有空格字符。
要么修复输入文件,要么使用Trim()
来摆脱它:
...
if (!line.Contains("--")) {
graph[line.Trim()] = new City {name = line.Substring(0, line.Length - 1)};
...