本帖最后由 翳影 于 2011-3-31 12:19 编辑
Object Class (System)
System Namespace ()
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Array::SetValue Method (Object, Int32, Int32)[size=1em].NET Framework 4
Sets a value to the element at the specified position in the two-dimensional Array. The indexes are specified as 32-bit integers.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)Syntax
VBC#F#JScript
public:void SetValue( Object^ value, int index1, int index2)
ParametersvalueType: System::Object
The new value for the specified element.
index1Type: System::Int32
A 32-bit integer that represents the first-dimension index of the Array element to set.
index2Type: System::Int32
A 32-bit integer that represents the second-dimension index of the Array element to set.
The GetLowerBound and GetUpperBound methods can determine whether any of the indexes is out of bounds.
For more information about conversions, see Convert.
This method is an O(1) operation.
| Note | | If SetValue is used to assign nullptr
to an element of an array of value types, all fields of the element are initialized to zero. The value of the element is not a null reference, and cannot be found by searching for a null reference.
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Examples
The following code example demonstrates how to set and get a specific value in a one-dimensional or multidimensional array.
VB
C#
F#
JScript
using namespace System;
int main()
{
// Creates and initializes a one-dimensional array.
array^myArr1 = gcnew array(5);
// Sets the element at index 3.
myArr1->SetValue( "three", 3 );
Console::WriteLine( "[3]: {0}", myArr1->GetValue( 3 ) );
// Creates and initializes a two-dimensional array. array^myArr2 = gcnew array(5,5);
// Sets the element at index 1,3.
myArr2->SetValue( "one-three", 1, 3 );
Console::WriteLine( "[1,3]: {0}", myArr2->GetValue( 1, 3 ) );
// Creates and initializes a three-dimensional array.
array^myArr3 = gcnew array(5,5,5);
// Sets the element at index 1,2,3.
myArr3->SetValue( "one-two-three", 1, 2, 3 );
Console::WriteLine( "[1,2,3]: {0}", myArr3->GetValue( 1, 2, 3 ) );
// Creates and initializes a seven-dimensional array.
array^myArr7 = gcnew array(5,5,5,5,5,5,5);
// Sets the element at index 1,2,3,0,1,2,3.
array^myIndices = {1,2,3,0,1,2,3};
myArr7->SetValue( "one-two-three-zero-one-two-three", myIndices );
Console::WriteLine( "[1,2,3,0,1,2,3]: {0}", myArr7->GetValue( myIndices ) );}
/* This code produces the following output.
[3]: three
[1,3]: one-three
[1,2,3]: one-two-three
[1,2,3,0,1,2,3]: one-two-three-zero-one-two-three*/
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发表于 2011-3-31 10:06:01
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