Microsoft Official Silent lab Video Solution: Class Extension using Even

Time to Complete: 10 Minutes

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Solution Silent Video:

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To create an interface, follow these steps: 

 Step 01: Open the visual studio Project. Right-click on Project go to Add-> New Item 

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Step 02: Select code under dynamics 365 items and Interface in the middle pane, Input the name: IDrivable Click Add 

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Step 03: Add code to your class from the example given at end 

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Step 04: Right click on Project go to Add-> New Item 

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Step 05: Select code under dynamics 365 items and Class in the middle pane, Input the name: Automobile Click Add 

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Step 06: Add code to your class 

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Step 07: Add another class with name: UseAnAutoMobile 

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Step 08: Add code to your class using examples given at end 

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In the following example, an Automobile class implements an IDrivable interface. The is keyword is supported and lets you test whether a class implements an interface. 

Add the following code 

public interface IDrivable 

{ 

public int getSpeed() 

{ 

} 

public void setSpeed(int newSpeed) 

{ 

} 

} 

class Automobile implements IDrivable 

{ 

int m_speed; 

public int getSpeed() 

{ 

return m_speed; 

} 

public void setSpeed(int newSpeed) 

{ 

m_speed = newSpeed; 

} 

} 

class UseAnAutomobile 

{ 

void DriveAutomobile() 

{ 

IDrivable yourIDrivable; 

Automobile myAutomobile; 

str sTemp = “object is not an IDrivable”; 

myAutomobile = new Automobile(); 

if (myAutomobile is IDrivable) 

{ 

yourIDrivable = myAutomobile; 

yourIDrivable.setSpeed(42); 

sTemp = int2str(yourIDrivable.getSpeed()); 

} 

Global::info(sTemp); 

return; 

// output 

// Message (06:46:33 pm) 

// 42 

} 

} 

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