转义字符 显示形式 转换成 实际形式 \\n to \n

类1

public class EscapeCharacterEntities
{
    private static object _lookupLocker = new object();
    private static string[] _entitiesList = new string[]
    {
        "\n-n", 
        "\r-r",
        "\t-t", 
        "\f-f",           
        "\v-v" 
    };
    private static Hashtable _entitiesLoopupTable;
    private EscapeCharacterEntities() { }
    public static char Lookup(string entity)
    {
        if (_entitiesLoopupTable == null)
        {
            lock (_lookupLocker)
            {
                if (_entitiesLoopupTable == null)
                {
                    Hashtable curTable = new Hashtable();
                    foreach (string item in _entitiesList)
                    {
                        curTable[item.Substring(2)] = item[0];
                    }
                    _entitiesLoopupTable = curTable;
                }
            }
        }
        object obj = _entitiesLoopupTable[entity];

        return obj == null ? (char)0 : (char)obj;
    }
}

转换方法

public static string EscapeCharacterFormat(string input)
{
    StringBuilder builder = new StringBuilder();
    StringWriter writer = new StringWriter(builder);
    int l = input.Length;
    int maxIndex = l - 1;
    for (int i = 0; i < l; i++)
    {
        char ch = input[i];
        if (ch == '\\' && i < maxIndex)
        {
            char ch2 = input[i + 1];
            char curchar = EscapeCharacterEntities.Lookup(ch2.ToString());
            if (curchar != (char)0)
            {
                writer.Write(curchar);
                i++;
                continue;
            }
        }
        writer.Write(ch);
    }
    return builder.ToString();
}