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1 using System;
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2
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3 using NUnit.Framework;
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4
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5 using BLToolkit.Patterns;
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6
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7 namespace HowTo.Patterns
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8 {
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9 //[TestFixture]
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10 public class DuckTyping
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11 {
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12 // By default, all interface methods are optional.
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13 //
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14 public interface OptionalInterface
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15 {
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16 // If the source object does not implement the [b]Method1[/b], a NotImplementedException is thrown at [i]run time[/i].
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17 //
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18 void Method1();
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19
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20 // If the source object does not implement the [b]Method2[/b], a TypeBuilderException is thrown at [i]build time[/i].
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21 //
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22 /*[a]*/[MustImplement]/*[/a]*/
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23 void Method2();
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24
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25 // If the source object does not implement the [b]Method3[/b], an empty stub is genegated.
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26 // The return value and all output parameters will be set to default values.
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27 //
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28 /*[a]*/[MustImplement(false, false)]/*[/a]*/
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29 int Method3();
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30 }
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31
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32 // The MustImplement attribute also can control the entire interface.
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33 //
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34 /*[a]*/[MustImplement]/*[/a]*/
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35 public interface RequiredInterface
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36 {
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37 // If the source object does not implement the [b]Method1[/b], a TypeBuilderException is thrown at [i]build time[/i].
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38 //
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39 void Method1();
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40
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41 // If the source object does not implement the [b]Method2[/b], a NotImplementedException is thrown at [i]run time[/i].
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42 //
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43 /*[a]*/[MustImplement(false)]/*[/a]*/
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44 void Method2();
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45
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46 // If the source object does not implement the [b]Method3[/b], an empty stub is genegated.
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47 // The return value and all output parameters will be set to default values.
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48 //
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49 /*[a]*/[MustImplement(false, false)]/*[/a]*/
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50 int Method3();
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51 }
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52
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53 public class TestClass
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54 {
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55 public int Method3()
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56 {
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57 return 3;
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58 }
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59 }
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60
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61 // Two or more interfaces can be mixed together.
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62 //
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63 public interface InterfaceMix : RequiredInterface, OptionalInterface
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64 {
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65 }
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66
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67 //[Test]
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68 public void Test()
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69 {
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70 InterfaceMix duck = /*[a]*/BLToolkit.Patterns.DuckTyping.Implement/*[/a]*/<InterfaceMix>(new TestClass());
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71 RequiredInterface duck1 = duck;
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72 OptionalInterface duck2 = duck;
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73
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74 duck1.Method1();
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75 duck2.Method1();
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76 }
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77 }
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78 }
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