Array.Length 屬性(System) | Microsoft Docs

它也會使用GetUpperBound 方法來判斷多維度陣列中每個維度中的專案數目。

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本文內容 取得Array所有維度的元素總數。

public: propertyintLength{intget();}; publicintLength{get;} memberthis.Length:int PublicReadOnlyPropertyLengthAsInteger 屬性值 Int32 Array所有維度的項目總數；如果陣列中沒有項目，則為零。

例外狀況 OverflowException 陣列是多維度的，且包含超過Int32.MaxValue元素。

範例 下列範例會Length使用屬性來取得陣列中的元素總數。

它也會使用GetUpperBound方法來判斷多維度陣列中每個維度中的專案數目。

usingSystem; publicclassExample { publicstaticvoidMain() { //Declareasingle-dimensionalstringarray String[]array1d={"zero","one","two","three"}; ShowArrayInfo(array1d); //Declareatwo-dimensionalstringarray String[,]array2d={{"zero","0"},{"one","1"}, {"two","2"},{"three","3"}, {"four","4"},{"five","5"}}; ShowArrayInfo(array2d); //Declareathree-dimensionalintegerarray int[,,]array3d=newint[,,]{{{1,2,3},{4,5,6}}, {{7,8,9},{10,11,12}}}; ShowArrayInfo(array3d); } privatestaticvoidShowArrayInfo(Arrayarr) { Console.WriteLine("LengthofArray:{0,3}",arr.Length); Console.WriteLine("NumberofDimensions:{0,3}",arr.Rank); //Formultidimensionalarrays,shownumberofelementsineachdimension. if(arr.Rank>1){ for(intdimension=1;dimension<=arr.Rank;dimension++) Console.WriteLine("Dimension{0}:{1,3}",dimension, arr.GetUpperBound(dimension-1)+1); } Console.WriteLine(); } } //Theexampledisplaysthefollowingoutput: //LengthofArray:4 //NumberofDimensions:1 // //LengthofArray:12 //NumberofDimensions:2 //Dimension1:6 //Dimension2:2 // //LengthofArray:12 //NumberofDimensions:3 //Dimension1:2 //Dimension2:2 //Dimension3:3 openSystem letshowArrayInfo(arr:Array)= printfn$"LengthofArray:{arr.Length,3}" printfn$"NumberofDimensions:{arr.Rank,3}" //Formultidimensionalarrays,shownumberofelementsineachdimension. ifarr.Rank>1then fordimension=1toarr.Rankdo printfn$"Dimension{dimension}:{arr.GetUpperBound(dimension-1)+1,3}" printfn"" //Declareasingle-dimensionalstringarray letarray1d=[|"zero";"one";"two";"three"|] showArrayInfoarray1d //Declareatwo-dimensionalstringarray letarray2d= array2D[["zero";"0"];["one";"1"] ["two";"2"];["three";"3"] ["four";"4"];["five";"5"]] showArrayInfoarray2d //Declareathree-dimensionalintegerarray letarray3d=Array3D.create223"zero" showArrayInfoarray3d //Theexampledisplaysthefollowingoutput: //LengthofArray:4 //NumberofDimensions:1 // //LengthofArray:12 //NumberofDimensions:2 //Dimension1:6 //Dimension2:2 // //LengthofArray:12 //NumberofDimensions:3 //Dimension1:2 //Dimension2:2 //Dimension3:3 ModuleExample PublicSubMain() 'Declareasingle-dimensionalstringarray Dimarray1d()AsString={"zero","one","two","three"} ShowArrayInfo(array1d) 'Declareatwo-dimensionalstringarray Dimarray2d(,)AsString={{"zero","0"},{"one","1"}, {"two","2"},{"three","3"}, {"four","4"},{"five","5"}} ShowArrayInfo(array2d) 'Declareathree-dimensionalintegerarray Dimarray3d(,,)AsInteger=NewInteger(,,){{{1,2,3},{4,5,6}}, {{7,8,9},{10,11,12}}} ShowArrayInfo(array3d) EndSub PrivateSubShowArrayInfo(arrAsArray) Console.WriteLine("LengthofArray:{0,3}",arr.Length) Console.WriteLine("NumberofDimensions:{0,3}",arr.Rank) 'Formultidimensionalarrays,shownumberofelementsineachdimension. Ifarr.Rank>1Then FordimensionAsInteger=1Toarr.Rank Console.WriteLine("Dimension{0}:{1,3}",dimension, arr.GetUpperBound(dimension-1)+1) Next EndIf Console.WriteLine() EndSub EndModule 'Theexampledisplaysthefollowingoutput: 'LengthofArray:4 'NumberofDimensions:1 ' 'LengthofArray:12 'NumberofDimensions:2 'Dimension1:6 'Dimension2:2 ' 'LengthofArray:12 'NumberofDimensions:3 'Dimension1:2 'Dimension2:2 'Dimension3:3 備註 擷取這個屬性的值是一種O(1)運算。

適用於 另請參閱 GetLength(Int32) GetUpperBound(Int32) GetLowerBound(Int32) LongLength Count Rank 本文內容