C# String: Split

緣起

由於切割字串蠻常用的, 它有各種不同的多型, 這裡只記錄最常用的一個方式: String.Split Method (String[], StringSplitOptions)

程式範例

以下範例來自 MSDN

string source = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]";
string[] stringSeparators = new string[] { "[stop]" };  //建立切割依據的字串陣列 stringSeparators[0] = "[stop]"
string[] result;

// Display the original string and delimiter string.
Console.WriteLine("Splitting the string:\n   \"{0}\".", source);
Console.WriteLine();
Console.WriteLine("Using the delimiter string:\n   \"{0}\"",
      stringSeparators[0]);
Console.WriteLine();

// Split a string delimited by another string and return all elements.
//開始進行切割, 切割時, 會將空字串 (Empty or null) 也視為切割後的一個陣列元素
result = source.Split(stringSeparators, StringSplitOptions.None);  
Console.WriteLine("Result including all elements ({0} elements):",
      result.Length);
Console.Write("   ");
foreach (string s in result)  //將切割後的字串進行逐一顯示
{
 Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);
}
Console.WriteLine();
Console.WriteLine();

// Split delimited by another string and return all non-empty elements.
//開始進行切割, 切割時, 空字串 (Empty or Null) 不會列入陣列元素
result = source.Split(stringSeparators,
       StringSplitOptions.RemoveEmptyEntries);
Console.WriteLine("Result including non-empty elements ({0} elements):",
      result.Length);
Console.Write("   ");
foreach (string s in result)
{
 Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);
}
Console.WriteLine();

執行結果

參考文件

• String.Split Method (String[], StringSplitOptions)