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如何：測試 Point4D 結構是否相等和不相等

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此範例會示範如何測試 Point4D 結構是否相等和不相等。

下列程式碼說明如何使用 Point4D 相等方法測試 Point4D 結構是否相等和不相等。 Point4D 結構會透過使用多載的相等 (==) 運算子來測試是否相等，然後使用多載不相等 (!=) 運算子來測試是否不相等，最後使用靜態 Equals 方法檢查 Point3D 結構和 Point4D 結構是否相等。

範例

// instantiate Points
Point4D point4D1 = new Point4D();
Point4D point4D2 = new Point4D(15, 40, 60, 75);
Point3D point3D1 = new Point3D(15, 40, 60);

// result variables
Boolean areEqual;
Boolean areNotEqual;
String stringResult;

// defining x,y,z,w of point1
point4D1.X = 10;
point4D1.Y = 5;
point4D1.Z = 1;
point4D1.W = 4;

// checking if Points are equal
areEqual = point4D1 == point4D2;

// areEqual is False

// checking if Points are not equal
areNotEqual = point4D1 != point4D2;
// areNotEqual is True

if (Point4D.Equals(point4D1, point3D1))
{
    // the if condition is not true, so this block will not execute
    stringResult = "Both objects are Point4D structures and they are equal";
}

else
{
    // the if condition is false, so this branch will execute
    stringResult = "Parameters are not both Point4D strucutres, or they are but are not equal";
}

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