string 类型方法

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大小写转换:

function ToLower: string;function ToLower(LocaleID: TLocaleID): string;function ToLowerInvariant: string;function ToUpper: string;function ToUpper(LocaleID: TLocaleID): string;function ToUpperInvariant: string;class function LowerCase(const S: string): string;class function LowerCase(const S: string; LocaleOptions: TLocaleOptions): string;class function UpperCase(const S: string): string;class function UpperCase(const S: string; LocaleOptions: TLocaleOptions): string;//--------------------------------------------------------------------------------var  str: string;begin  str := 'Delphi';  str := str.ToLower; // delphi  str := str.ToUpper; // DELPHIend;

清除两边空格或指定字符:

function Trim: string;function TrimLeft: string;function TrimRight: string;function Trim(const TrimChars: array of Char): string;function TrimLeft(const TrimChars: array of Char): string;function TrimRight(const TrimChars: array of Char): string;//--------------------------------------------------------------------------------var  str1, str2: string;begin  str1 := '   Delphi 10000   ';  str2 := str1.TrimLeft;  // 'Delphi 10000   '  str2 := str1.TrimRight; // '   Delphi 10000'  str2 := str1.Trim;      // 'Delphi 10000'  str2 := str1.Trim([' ', '0']); // 'Delphi 1'end;

字符串对比:

function CompareTo(const strB: string): Integer;class function Compare(const StrA: string; const StrB: string): Integer;class function CompareText(const StrA: string; const StrB: string): Integer;class function Compare(const StrA: string; const StrB: string; LocaleID: TLocaleID): Integer;class function Compare(const StrA: string; const StrB: string; IgnoreCase: Boolean): Integer;class function Compare(const StrA: string; const StrB: string; IgnoreCase: Boolean; LocaleID: TLocaleID): Integer;class function Compare(const StrA: string; IndexA: Integer; const StrB: string; IndexB: Integer; Length: Integer): Integer;class function Compare(const StrA: string; IndexA: Integer; const StrB: string; IndexB: Integer; Length: Integer; LocaleID: TLocaleID): Integer;class function Compare(const StrA: string; IndexA: Integer; const StrB: string; IndexB: Integer; Length: Integer; IgnoreCase: Boolean): Integer;class function Compare(const StrA: string; IndexA: Integer; const StrB: string; IndexB: Integer; Length: Integer; IgnoreCase: Boolean; LocaleID: TLocaleID): Integer;class function CompareOrdinal(const StrA: string; const StrB: string): Integer;class function CompareOrdinal(const StrA: string; IndexA: Integer; const StrB: string; IndexB: Integer; Length: Integer): Integer;//--------------------------------------------------------------------------------var  str1, str2: string;  n: Integer;begin  str1 := 'ABC 123';  str2 := 'abc 123';  n := str1.CompareTo(str2);              // -32  n := str1.Compare(str1, str2);          // 1  n := str1.CompareText(str1, str2);      // 0; 相同  n := str1.Compare(str1, str2, True);    // 0; 不区分大小写  n := str1.CompareOrdinal(str1, str2);   // -32  n := str1.Compare(str1, 4, str2, 4, 3); // 0; 只对比后三位end;

搜索字符串:

function IndexOf(value: Char): Integer;function IndexOf(const Value: string): Integer;function IndexOf(Value: Char; StartIndex: Integer): Integer;function IndexOf(const Value: string; StartIndex: Integer): Integer;function IndexOf(Value: Char; StartIndex: Integer; Count: Integer): Integer;function IndexOf(const Value: string; StartIndex: Integer; Count: Integer): Integer;function IndexOfAny(const AnyOf: array of Char): Integer;function IndexOfAny(const AnyOf: array of Char; StartIndex: Integer): Integer;function IndexOfAny(const AnyOf: array of Char; StartIndex: Integer; Count: Integer): Integer;function LastIndexOf(Value: Char): Integer;function LastIndexOf(const Value: string): Integer;function LastIndexOf(Value: Char; StartIndex: Integer): Integer;function LastIndexOf(const Value: string; StartIndex: Integer): Integer;function LastIndexOf(Value: Char; StartIndex: Integer; Count: Integer): Integer;function LastIndexOf(const Value: string; StartIndex: Integer; Count: Integer): Integer;function LastIndexOfAny(const AnyOf: array of Char): Integer;function LastIndexOfAny(const AnyOf: array of Char; StartIndex: Integer): Integer;function LastIndexOfAny(const AnyOf: array of Char; StartIndex: Integer; Count: Integer): Integer;//--------------------------------------------------------------------------------var  str: string;  n: Integer;begin  str := 'A1 A2 A3 A4';  n := str.IndexOf('A');     // 0  n := str.LastIndexOf('A'); // 9  n := str.IndexOf('B');     // -1; 没找到  n := str.IndexOf('A', 1, str.Length - 1);                  // 3  n := str.LastIndexOf('A', str.Length - 1, str.Length - 1); // 9  n := str.IndexOfAny(['1', '2', '3', '4']);     // 1  n := str.LastIndexOfAny(['1', '2', '3', '4']); // 10end;

是否包含:

function Contains(const Value: string): Boolean;function StartsWith(const Value: string): Boolean;function StartsWith(const Value: string; IgnoreCase: Boolean): Boolean;function EndsWith(const Value: string): Boolean;function EndsWith(const Value: string; IgnoreCase: Boolean): Boolean;class function EndsText(const ASubText, AText: string): Boolean;//--------------------------------------------------------------------------------var  str: string;  b: Boolean;begin  str := 'Delphi XE4';  b := str.Contains('XE'); // True  b := str.Contains('xe'); // False  b := str.StartsWith('delphi');       // False  b := str.StartsWith('delphi', True); // True  b := str.EndsWith('XE4');            // True  b := str.EndsText('xe4', str);       // Trueend;

添加或解除引号:

function QuotedString: string;function QuotedString(const QuoteChar: Char): string;function DeQuotedString: string;function DeQuotedString(const QuoteChar: Char): string;//--------------------------------------------------------------------------------var  str1, str2: string;begin  str1 := 'Delphi';  str2 := str1.QuotedString;        // 'Delphi'  str2 := str1.QuotedString('"');   // "Delphi"  str1 := '"Delphi"';  str2 := str1.DeQuotedString('"'); // Delphiend;

适宽处理:

function PadLeft(TotalWidth: Integer): string;function PadLeft(TotalWidth: Integer; PaddingChar: Char): string;function PadRight(TotalWidth: Integer): string;function PadRight(TotalWidth: Integer; PaddingChar: Char): string;//--------------------------------------------------------------------------------var  str: string;begin  str := '1';  str := str.PadLeft(4, '0'); // 0001end;

插入与删除:

function Insert(StartIndex: Integer; const Value: string): string;function Remove(StartIndex: Integer): string;function Remove(StartIndex: Integer; Count: Integer): string;//--------------------------------------------------------------------------------var  str1, str2: string;begin  str1 := 'Delphi 4';  str2 := str1.Insert(7, 'XE'); // Delphi XE4  str1 := 'Delphi XE4';  str2 := str1.Remove(6);    // Delphi  str2 := str1.Remove(7, 2); // Delphi 4end;

截取:

function Substring(StartIndex: Integer): string;function Substring(StartIndex: Integer; Length: Integer): string;//--------------------------------------------------------------------------------var  str1, str2: string;begin  str1 := 'Delphi XE4';  str2 := str1.Substring(7);    // XE4  str2 := str1.Substring(7, 2); // XEend;

替换:

function Replace(OldChar: Char; NewChar: Char): string;function Replace(OldChar: Char; NewChar: Char; ReplaceFlags: TReplaceFlags): string;function Replace(const OldValue: string; const NewValue: string): string;function Replace(const OldValue: string; const NewValue: string; ReplaceFlags: TReplaceFlags): string;//--------------------------------------------------------------------------------var  str1, str2: string;begin  str1 := 'ABC ABC ABC';  str2 := str1.Replace('A', '*');                 // *BC *BC *BC  str2 := str1.Replace('A', '*', [rfIgnoreCase]); // *BC ABC ABCend;

分割:

function Split(const Separator: array of Char): TArray<string>;function Split(const Separator: array of Char; Count: Integer): TArray<string>;function Split(const Separator: array of Char; Options: TStringSplitOptions): TArray<string>;function Split(const Separator: array of string; Options: TStringSplitOptions): TArray<string>;function Split(const Separator: array of Char; Count: Integer; Options: TStringSplitOptions): TArray<string>;function Split(const Separator: array of string; Count: Integer; Options: TStringSplitOptions): TArray<string>;//--------------------------------------------------------------------------------var  str: string;  arr: TArray<string>;begin  str := 'A-1,B-2,,,C-3,D-4';  arr := str.Split([',']);                                   // arr[0] = A-1; Length(arr) = 6  arr := str.Split([','], TStringSplitOptions.ExcludeEmpty); // 忽略空项; Length(arr) = 4  arr := str.Split([','], 2);                                // 只提取前 2  arr := str.Split([',', '-'], ExcludeEmpty); //arr[0] = A; Length(arr) = 8  arr := str.Split([',,,'], None);            // 分隔符可以是一个字符串数组end;

连接:

class function Join(const Separator: string; const values: array of const): string;class function Join(const Separator: string; const Values: array of string): string;class function Join(const Separator: string; const Values: IEnumerator<string>): string;class function Join(const Separator: string; const Values: IEnumerable<string>): string;class function Join(const Separator: string; const value: array of string; StartIndex: Integer; Count: Integer): string;//--------------------------------------------------------------------------------var  S: string;  str: string;  strArr: TArray<string>;begin  str := 'A1,B2,C3,,,,D4,E5,F6,G7';  strArr := str.Split([','], ExcludeEmpty);  str := S.Join('-', strArr);             // A1-B2-C3-D4-E5-F6-G7  str := S.Join('; ', [1,2,3,4,5]);       // 1; 2; 3; 4; 5  str := S.Join(',', ['abc', 123, true]); // abc,123,Trueend;

类型转换:

function ToBoolean: Boolean;function ToInteger: Integer;function ToSingle: Single;function ToDouble: Double;function ToExtended: Extended;class function ToBoolean(const S: string): Boolean;class function ToInteger(const S: string): Integer;class function ToSingle(const S: string): Single;class function ToDouble(const S: string): Double;class function ToExtended(const S: string): Extended;class function Parse(const Value: Integer): string;class function Parse(const Value: Int64): string;class function Parse(const Value: Boolean): string;class function Parse(const Value: Extended): string;//--------------------------------------------------------------------------------var  S: string;  str: string;  n: Integer;  b: Boolean;  f: Double;begin  str := S.Parse(123);  n := str.ToInteger;  // 123  b := str.ToBoolean;  // True  str := S.Parse(True);  b := str.ToBoolean;  // True  n := str.ToInteger;  // -1  str := S.Parse(3.14159260000);  f := str.ToDouble;  //3.1415926end;

定界符:

function IsDelimiter(const Delimiters: string; Index: Integer): Boolean;function LastDelimiter(const Delims: string): Integer;//--------------------------------------------------------------------------------var  str: string;  b: Boolean;  n: Integer;begin  str := 'http://del.cnblogs.com';  b := str.IsDelimiter(':', 4);  // True  b := str.IsDelimiter('//', 5); // True  n := str.LastDelimiter('.');   // 18  n := str.IndexOf('.');         // 10end;

空字符串:

const Empty = '';function IsEmpty: Boolean;class function IsNullOrEmpty(const Value: string): Boolean;class function IsNullOrWhiteSpace(const Value: string): Boolean;//--------------------------------------------------------------------------------var  S: string;  str: string;  b: Boolean;begin  str := '       ';  b := str.IsEmpty;               // False  b := S.IsNullOrWhiteSpace(str); // Trueend;

String 与 Char:

class function Create(C: Char; Count: Integer): string;class function Create(const Value: array of Char; StartIndex: Integer; Length: Integer): string;class function Create(const Value: array of Char): string;property Chars[Index: Integer]: Char read GetChars;property Length: Integer read GetLength;function CountChar(const C: Char): Integer;function ToCharArray: TArray<Char>;function ToCharArray(StartIndex: Integer; Length: Integer): TArray<Char>;procedure CopyTo(SourceIndex: Integer; var destination: array of Char; DestinationIndex: Integer; Count: Integer);//--------------------------------------------------------------------------------var  S: string;  str, str2: string;  charArr: TCharArray;  n: Integer;  c: Char;begin  str := 'ABC';  n := str.Length;   // 3  c := str.Chars[0]; // A = str[1]  str := S.Create('A', 7); // AAAAAAA  charArr := 'ABCDEFG'.ToCharArray;  str := s.Create(charArr);       // ABCDEFG  str := S.Create(charArr, 1, 3); // BCD  charArr := '1234567890'.ToCharArray;  str := 'ABCDEFG';  str.CopyTo(1, charArr, 2, 3);  str := S.Create(charArr);       // 12BCD67890end;

其他:

function Equals(const Value: string): Boolean;function GetHashCode: Integer;class function Equals(const a: string; const b: string): Boolean;class function Format(const Format: string; const args: array of const): string;class function Copy(const Str: string): string;//--------------------------------------------------------------------------------// 用 Equals 不如直接用 = 号// 用 Copy 不如直接用 :=// 用 string.Format 不如直接用 Format()// 总之, 还是有用处的多!

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