写了一个字符串的二维表: TSta

STA 单元 (用到 System.SysUtils.TStringHelper):

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unit STA;

interface

uses System.SysUtils, System.Classes;

type
  TSta = record
    FSeparator: Char;
    FArr: TArray<TArray<string>>;
    constructor Create(const aStr: string; const aSeparator: Char = ';'); overload;
    class operator Explicit(const aStr: string): TSta;
    class operator Implicit(const aStr: string): TSta;
    function GetItem(i,j: Integer): string;
    procedure SetItem(i,j: Integer; Value: string);
    function GetRow(i: Integer): string;
    procedure SetRow(i: Integer; Value: string);
    procedure SetSeparator(const Value: Char);
    function GetRowCount: Integer;
    procedure SetRowCount(const Value: Integer);
    function ToString: string;
    procedure Clear;
    procedure LoadFromFile(const aFileName: string; aEncoding: TEncoding = nil);
    procedure SaveToFile(const aFileName: string; aEncoding: TEncoding = nil);
    property Separator: Char read FSeparator write SetSeparator;
    property RowCount: Integer read GetRowCount write SetRowCount;
    property Items[i,j: Integer]: string read GetItem write SetItem; default;
    property Rows[i: Integer]: string read GetRow write SetRow;
  end;

implementation

{ TSta }

procedure TSta.Clear;
begin
  SetLength(FArr, );
end;

constructor TSta.Create(const aStr: string; const aSeparator: Char);
var
  tArr: TArray<string>;
  i: Integer;
begin
  FSeparator := aSeparator;
  tArr := aStr.Split([sLineBreak], ExcludeEmpty);
  SetLength(FArr, Length(tArr));
  for i :=  to High(FArr) do
  begin
    FArr[i] := tArr[i].Split([FSeparator]);
  end;
end;

function TSta.GetItem(i,j: Integer): string;
begin
  Result := '';
  if (i < ) or (j < ) then Exit;
  if (i < Length(FArr)) and (j < Length(FArr[i])) then
    Result := FArr[i, j].Trim;
end;

procedure TSta.SetItem(i,j: Integer; Value: string);
var
  k,n: Integer;
begin
  if Value.Trim = '' then Exit;
  if Length(FArr) =  then FSeparator := ';';
  n := Length(FArr);
  if i >= n then
  begin
    SetLength(FArr, i+);
    for k := n to i -  do SetLength(FArr[k], );
  end;
  if j >= Length(FArr[i]) then SetLength(FArr[i], j+);
  FArr[i,j] := Value.Trim;
end;

function TSta.GetRow(i: Integer): string;
begin
  Result := '';
  if i < Length(FArr) then
  begin
    if Length(FArr[i]) >  then
      Result := Result.Join(FSeparator, FArr[i]);
  end;
end;

function TSta.GetRowCount: Integer;
begin
  Result := Length(FArr);
end;

procedure TSta.SetRow(i: Integer; Value: string);
var
  k,n: Integer;
begin
  if Value.Trim = '' then Exit;
  if Length(FArr) =  then FSeparator := ';';
  n := Length(FArr);
  if i >= n then
  begin
    SetLength(FArr, i+);
    for k := n to i -  do SetLength(FArr[k], );
  end;
  FArr[i] := Value.Split([FSeparator]);
end;

procedure TSta.SetRowCount(const Value: Integer);
begin
  SetLength(FArr, Value);
end;

procedure TSta.SetSeparator(const Value: Char);
begin
  FSeparator := Value;
  if Length(FArr) =  then SetLength(FArr, ); //直接使用索引赋值时, 会根据 Length(FArr) 是否为  来设置默认分隔符
end;

class operator TSta.Explicit(const aStr: string): TSta;
begin
  Result := TSta.Create(aStr);
end;

class operator TSta.Implicit(const aStr: string): TSta;
begin
  Result := TSta.Create(aStr);
end;

function TSta.ToString: string;
var
  i: Integer;
begin
  if Length(FArr) =  then Exit('');
  Result := Rows[];
  for i :=  to High(FArr) do
    Result := Result + sLineBreak + Rows[i];
end;

procedure TSta.LoadFromFile(const aFileName: string; aEncoding: TEncoding);
begin
  if not FileExists(aFileName) then Exit;
  if aEncoding = nil then aEncoding := TEncoding.Default;
  with TStringList.Create do begin
    LoadFromFile(aFileName, aEncoding);
    Self := Text;
    Free;
  end;
end;

procedure TSta.SaveToFile(const aFileName: string; aEncoding: TEncoding);
begin
  if aEncoding = nil then aEncoding := TEncoding.Default;
  with TStringList.Create do begin
    Text := Self.ToString;
    SaveToFile(aFileName, aEncoding);
    Free;
  end;
end;

end.

测试:

---

uses STA;

procedure TForm1.Button1Click(Sender: TObject);
var
  S: TSta;
  str: string;
begin
  S := 'AAA;BBB;CCC' + sLineBreak + '111;222;333'; //可以从字符串隐式或显式地转换到 TSta

  str := S[,];    //AAA
  str := S[,];    //
  str := S[,];    //越界读取返回空

  str := S.Rows[]; //AAA;BBB;CCC
  str := S.Rows[]; //;;

  str := S.ToString; //AAA;BBB;CCC
                     //;:

  S.Separator := '&'; //更换分隔符; 默认是分号; 也可在 Create 时指定
  str := S.Rows[];   //&&
  ShowMessage(str);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  S: TSta;
  str: string;
begin
  S[,] := 'aaa';
  S[,] := 'bbb';
  S[,] := 'ccc';
  S[,] := 'zzz';

  str := S.ToString; //aaa;bbb;ccc
                     //
                     //;;zzz

  S.Rows[] := '111;222;333';
  str := S.ToString; //aaa;bbb;ccc
                     //;;
                     //;;zzz
//  ShowMessage(str);
end;

procedure TForm1.Button3Click(Sender: TObject);
const
  nFileName = 'c:\temp\staTest.txt';
var
  S: TSta;
  str: string;
begin
  S[,] := 'aaa';
  S[,] := 'bbb';
  S[,] := 'ccc';
  S[,] := '';
  S[,] := '';
  S[,] := '';
  S[,] := '';
  S.SaveToFile(nFileName);   //保存到文件
  S.Clear;
  str := S[,]; //空
//  ShowMessage(str);

  S.LoadFromFile(nFileName); //从文件读取
  str := S[,];    //aaa
  str := S.Rows[]; //aaa;bbb;ccc
//  ShowMessage(str);
end;

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