public static string ToSnakeCase(string s)
{
if (string.IsNullOrEmpty(s))
{
return(s);
}
StringBuilder sb = new StringBuilder();
SnakeCaseState state = SnakeCaseState.Start;
for (int i = 0; i < s.Length; i++)
{
if (s[i] == ' ')
{
if (state != SnakeCaseState.Start)
{
state = SnakeCaseState.NewWord;
}
}
else if (char.IsUpper(s[i]))
{
switch (state)
{
case SnakeCaseState.Upper:
bool hasNext = (i + 1 < s.Length);
if (i > 0 && hasNext)
{
char nextChar = s[i + 1];
if (!char.IsUpper(nextChar) && nextChar != '_')
{
sb.Append('_');
}
}
break;
case SnakeCaseState.Lower:
case SnakeCaseState.NewWord:
sb.Append('_');
break;
}
char c;
#if !(DOTNET || PORTABLE)
c = char.ToLower(s[i], CultureInfo.InvariantCulture);
#else
c = char.ToLowerInvariant(s[i]);
#endif
sb.Append(c);
state = SnakeCaseState.Upper;
}
else if (s[i] == '_')
{
sb.Append('_');
state = SnakeCaseState.Start;
}
else
{
if (state == SnakeCaseState.NewWord)
{
sb.Append('_');
}
sb.Append(s[i]);
state = SnakeCaseState.Lower;
}
}
return(sb.ToString());
}
/// <summary>
/// 将字符串转换为蛇形策略
/// </summary>
/// <param name="str">字符串</param>
/// <returns></returns>
public static string ToSnakeCase(string str)
{
if (string.IsNullOrEmpty(str))
{
return(str);
}
StringBuilder sb = new StringBuilder();
SnakeCaseState state = SnakeCaseState.Start;
for (var i = 0; i < str.Length; i++)
{
if (str[i] == ' ')
{
if (state != SnakeCaseState.Start)
{
state = SnakeCaseState.NewWord;
}
}
else if (char.IsUpper(str[i]))
{
switch (state)
{
case SnakeCaseState.Upper:
bool hasNext = (i + 1 < str.Length);
if (i > 0 && hasNext)
{
char nextChar = str[i + 1];
if (!char.IsUpper(nextChar) && nextChar != '_')
{
sb.Append('_');
}
}
break;
case SnakeCaseState.Lower:
case SnakeCaseState.NewWord:
sb.Append('_');
break;
}
sb.Append(char.ToLowerInvariant(str[i]));
state = SnakeCaseState.Upper;
}
else if (str[i] == '_')
{
sb.Append('_');
state = SnakeCaseState.Start;
}
else
{
if (state == SnakeCaseState.NewWord)
{
sb.Append('_');
}
sb.Append(str[i]);
state = SnakeCaseState.Lower;
}
}
return(sb.ToString());
}
/// <summary>
/// 如：AreYouOk转成are_you_ok
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string ToSnakeCase(string s)
{
if (string.IsNullOrEmpty(s))
{
return(s);
}
StringBuilder stringBuilder = new StringBuilder();
SnakeCaseState snakeCaseState = SnakeCaseState.Start;
for (int i = 0; i < s.Length; i++)
{
if (s[i] == ' ')
{
if (snakeCaseState != 0)
{
snakeCaseState = SnakeCaseState.NewWord;
}
}
else if (char.IsUpper(s[i]))
{
switch (snakeCaseState)
{
case SnakeCaseState.Upper:
{
bool flag = i + 1 < s.Length;
if (i > 0 && flag)
{
char c = s[i + 1];
if (!char.IsUpper(c) && c != '_')
{
stringBuilder.Append('_');
}
}
break;
}
case SnakeCaseState.Lower:
case SnakeCaseState.NewWord:
stringBuilder.Append('_');
break;
}
char value = char.ToLower(s[i], CultureInfo.InvariantCulture);
stringBuilder.Append(value);
snakeCaseState = SnakeCaseState.Upper;
}
else if (s[i] == '_')
{
stringBuilder.Append('_');
snakeCaseState = SnakeCaseState.Start;
}
else
{
if (snakeCaseState == SnakeCaseState.NewWord)
{
stringBuilder.Append('_');
}
stringBuilder.Append(s[i]);
snakeCaseState = SnakeCaseState.Lower;
}
}
return(stringBuilder.ToString());
}
public string ToSnakeCaseNewtonsoftJson()
{
if (string.IsNullOrEmpty(name))
{
return(name);
}
StringBuilder sb = new StringBuilder();
SnakeCaseState state = SnakeCaseState.Start;
for (int i = 0; i < name.Length; i++)
{
if (name[i] == ' ')
{
if (state != SnakeCaseState.Start)
{
state = SnakeCaseState.NewWord;
}
}
else if (char.IsUpper(name[i]))
{
switch (state)
{
case SnakeCaseState.Upper:
bool hasNext = (i + 1 < name.Length);
if (i > 0 && hasNext)
{
char nextChar = name[i + 1];
if (!char.IsUpper(nextChar) && nextChar != '_')
{
sb.Append('_');
}
}
break;
case SnakeCaseState.Lower:
case SnakeCaseState.NewWord:
sb.Append('_');
break;
}
char c;
#if HAVE_CHAR_TO_LOWER_WITH_CULTURE
c = char.ToLower(s[i], CultureInfo.InvariantCulture);
#else
c = char.ToLowerInvariant(name[i]);
#endif
sb.Append(c);
state = SnakeCaseState.Upper;
}
else if (name[i] == '_')
{
sb.Append('_');
state = SnakeCaseState.Start;
}
else
{
if (state == SnakeCaseState.NewWord)
{
sb.Append('_');
}
sb.Append(name[i]);
state = SnakeCaseState.Lower;
}
}
return(sb.ToString());
}
public static string ToSnakeCase(string s)
{
if (string.IsNullOrEmpty(s))
{
return(s);
}
StringBuilder builder = new StringBuilder();
SnakeCaseState start = SnakeCaseState.Start;
for (int i = 0; i < s.Length; i++)
{
if (s[i] == ' ')
{
if (start != SnakeCaseState.Start)
{
start = SnakeCaseState.NewWord;
}
continue;
}
if (char.IsUpper(s[i]))
{
switch (start)
{
case SnakeCaseState.Lower:
case SnakeCaseState.NewWord:
builder.Append('_');
break;
case SnakeCaseState.Upper:
{
bool flag = (i + 1) < s.Length;
if ((i > 0) & flag)
{
char c = s[i + 1];
if (!char.IsUpper(c) && (c != '_'))
{
builder.Append('_');
}
}
break;
}
}
char ch2 = char.ToLower(s[i], CultureInfo.InvariantCulture);
builder.Append(ch2);
start = SnakeCaseState.Upper;
continue;
}
if (s[i] == '_')
{
builder.Append('_');
start = SnakeCaseState.Start;
}
else
{
if (start == SnakeCaseState.NewWord)
{
builder.Append('_');
}
builder.Append(s[i]);
start = SnakeCaseState.Lower;
}
}
return(builder.ToString());
}
public static string ToSnakeCase(string s)
{
if (string.IsNullOrEmpty(s))
{
return(s);
}
var sb = StringBuilderCache.Acquire();
SnakeCaseState state = SnakeCaseState.Start;
for (int i = 0; i < s.Length; i++)
{
if (s[i] == ' ')
{
if (state != SnakeCaseState.Start)
{
state = SnakeCaseState.NewWord;
}
}
else if (char.IsUpper(s[i]))
{
switch (state)
{
case SnakeCaseState.Upper:
bool hasNext = (i + 1 < s.Length);
if (i > 0 && hasNext)
{
char nextChar = s[i + 1];
if (!char.IsUpper(nextChar) && nextChar != '_')
{
sb.Append('_');
}
}
break;
case SnakeCaseState.Lower:
case SnakeCaseState.NewWord:
sb.Append('_');
break;
}
char c;
#if HAVE_CHAR_TO_LOWER_WITH_CULTURE
c = char.ToLower(s[i], CultureInfo.InvariantCulture);
#else
c = char.ToLowerInvariant(s[i]);
#endif
sb.Append(c);
state = SnakeCaseState.Upper;
}
else if (s[i] == '_')
{
sb.Append('_');
state = SnakeCaseState.Start;
}
else
{
if (state == SnakeCaseState.NewWord)
{
sb.Append('_');
}
sb.Append(s[i]);
state = SnakeCaseState.Lower;
}
}
return(StringBuilderCache.GetStringAndRelease(sb));
}
