结合实例，讲一下public、private、protected、internal和protected internal的作用范围。 如下代码： 1: using System; 2: using System.Collections.Generic; 3: using System.Text; 4: 5: namespace AccessModifier 6: { 7: public class AccessModifierClass 8: { 9: public string GetPublicString() 10: { 11: return "Public String"; 12: } 13: 14: protected string GetProtectedString() 15: { 16: return "Protected String"; 17: } 18: 19: private string GetPrivateString() 20: { 21: return "Private String"; 22: } 23: 24: internal string GetInternalString() 25: { 26: return "Internal String"; 27: } 28: 29: protected internal string GetProtectedInternalString() 30: { 31: return "Protected Internal String"; 32: } 33: 34: void AvailableAccessModifier() 35: { 36: this.GetPublicString(); 37: this.GetPrivateString(); 38: this.GetInternalString(); 39: this.GetProtectedInternalString(); 40: this.GetProtectedString(); 41: } 42: } 43: 44: public class TestAccessModifierClass1 45: { 46: void AvailableAccessModifier() 47: { 48: AccessModifierClass item = new AccessModifierClass(); 49: item.GetPublicString(); 50: item.GetInternalString(); 51: item.GetProtectedInternalString(); 52: } 53: } 54: 55: public class TestAccessModifierClass2 : AccessModifierClass 56: { 57: void AvailableAccessModifier() 58: { 59: AccessModifierClass item = new AccessModifierClass(); 60: item.GetPublicString(); 61: item.GetInternalString(); 62: item.GetProtectedInternalString(); 63: base.GetProtectedString(); 64: } 65: } 66: } //AccessModifierClass是我们的访问修饰符类，里面有五种访问修饰符方法，可见在AccessModifierClass类里面的AvailableAccessModifier()方法//可以访问所有的方法。 //在TestAccessModifierClass1类中的AvailableAccessModifier()方法只能访问public、Internal和Protected Internal方法。 //TestAccessModifierClass2类继承自AccessModifierClass类，所以它的AvailableAccessModifier()方法可以访问public，internal,protected和pr//otected internal方法。 //在新建一个工程，且引用AccessModifierClass类的dll，代码如下： 1: using System; 2: using System.Collections.Generic; 3: using System.Text; 4: using AccessModifier; 5: 6: namespace AccessModifierApp 7: { 8: public class AccessModifierAppClass1 9: { 10: void AvailableAccessModifier() 11: { 12: AccessModifierClass item = new AccessModifierClass(); 13: item.GetPublicString(); 14: } 15: } 16: 17: public class AccessModifierAppClass2 : AccessModifierClass 18: { 19: void AvailableAccessModifier() 20: { 21: AccessModifierClass item = new AccessModifierClass(); 22: item.GetPublicString(); 23: base.GetProtectedString(); 24: base.GetProtectedInternalString(); 25: } 26: } 27: } //AccessModifierAppClass1类的AvailableAccessModifier()方法只能访问public方法。 //AccessModifierAppClass2类继承自AccessModifierClass类，所它的AvailableAccessModifier()方法可以访问public、protected和protected inte//rnal方法。
