[英]How to convert a char array to a string array?
鑒於:
一個字符串dayCodes
(即"MWF"
或"MRFU"
),我需要拆分並創建一個字符串集合,這樣我就可以得到星期幾字符串列表(即"Monday", "Wednesday", "Friday"
或"Monday", "Thursday", "Friday", "Sunday"
)。
// this causes a run-time exception because you can't cast Char to String
var daysArray = days.ToCharArray().Cast<string>().ToArray();
// for each dayCode, overwrite the code with the day string.
for (var i = 0; i < daysArray.Length; i++)
{
switch (daysArray[i])
{
case "M":
daysArray[i] = "Monday";
break;
case "T":
daysArray[i] = "Tuesday";
break;
case "W":
daysArray[i] = "Wednesday";
break;
case "R":
daysArray[i] = "Thursday";
break;
case "F":
daysArray[i] = "Friday";
break;
case "S":
daysArray[i] = "Saturday";
break;
case "U":
daysArray[i] = "Sunday";
break;
}
}
daysArray[daysArray.Length - 1] = "and " + daysArray[daysArray.Length - 1];
return string.Join(", ", daysArray);
問題:
問題是你不能將Char
為String
,我猜這是有道理的,因為一個不是從另一個繼承的。 您仍然認為編譯器會將Char
為一個字符長的String
。
有沒有快速的方法(比如使用Cast<string>()
)來執行此操作,所以我不必從頭創建List<string>
?
只需使用char.ToString()
就可以了:
var daysArray = days.ToCharArray().Select( c => c.ToString()).ToArray();
或者,在我的腦海中有一個更好的解決方案,為什么不直接將字符串與字典一起用於映射:
var daysArray = days.Select( c => dayMapping[c]).ToArray();
with dayMapping
只是一個映射到全天名稱的Dictionary<char, string>
:
Dictionary<char, string> dayMapping = new Dictionary<char,string>()
{
{ 'M', "Monday" },
{ 'T', "Tuesday" }
//and so on
}
char[] daysCodeArray = days.ToCharArray();
string[] daysArray = daysCodeArray.Select(el =>
{
switch (el)
{
case 'M':
return "Monday";
case 'T':
return "Tuesday";
case 'W':
return "Wednesday";
case 'R':
return "Thursday";
case 'F':
return "Friday";
case 'S':
return "Saturday";
case 'U':
return "Sunday";
}
throw new ArgumentException("Invalid day code");
}).ToArray();
如果需要,可以將lambda更改為單獨的方法。
要回答標題中的任何人在搜索中發現這個問題...(不是所描述的問題......那是早期帖子之一。)
var t =“ABC”;
var s = t.ToCharArray()。選擇(c => c.ToString())。ToArray();
你可以這樣做:
var dayCode = "MWF";
var daysArray = new List<string>();
var list = new Dictionary<string, string>{
{"M", "Monday"},
{"T", "Tuesday"},
{"W", "Wednesday"},
{"R", "Thursday"},
{"F", "Friday"},
{"S", "Saturday"},
{"U", "Sunday"}
};
for(int i = 0,max = dayCode.Length; i < max; i++)
{
var tmp = dayCode[i].ToString();
if(list.ContainsKey(tmp))
{
daysArray.Add(list[tmp]);
}
}
Console.WriteLine(string.Join(",", daysArray));
輸出:
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