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如何：测试 Point4D 结构是否相等和不相等

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此示例演示如何测试 Point4D 结构是否相等和不相等。

以下代码演示如何使用 Point4D 相等性方法测试 Point4D 结构是否相等和不相等。 使用重载相等(==) 运算符测试 Point4D 结构是否相等，然后使用重载不相等 (!=) 运算符进行不相等测试，最后使用静态 Equals 方法检查 Point3D 结构和 Point4D 结构是否相等。

示例

// 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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