System.ComponentModel.EventDescriptorCollection.Clear C# (CSharp) Method

        public void Clear() {
            if (readOnly) {
                throw new NotSupportedException();
            }

            eventCount = 0;
        }
        

		private void AssertReadOnly (EventDescriptorCollection descriptors, string testCase)
		{
			MockEventDescriptor desc = new MockEventDescriptor (
				"Date", "NOW");

			try {
				descriptors.Add (desc);
				Assert.Fail (testCase + "#1");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			// ensure read-only check if performed before value is checked
			try {
				descriptors.Add (null);
				Assert.Fail (testCase + "#2");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				descriptors.Clear ();
				Assert.Fail (testCase + "#3");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				descriptors.Insert (0, desc);
				Assert.Fail (testCase + "#4");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			// ensure read-only check if performed before value is checked
			try {
				descriptors.Insert (0, null);
				Assert.Fail (testCase + "#5");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				descriptors.Remove (desc);
				Assert.Fail (testCase + "#6");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			// ensure read-only check if performed before value is checked
			try {
				descriptors.Remove (null);
				Assert.Fail (testCase + "#7");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				descriptors.RemoveAt (0);
				Assert.Fail (testCase + "#8");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			IList list = (IList) descriptors;
			Assert.IsTrue (((IList) descriptors).IsReadOnly, testCase + "#9");
#if NET_2_0
			Assert.IsTrue (((IList) descriptors).IsFixedSize, testCase + "#10");
#else
			Assert.IsFalse (((IList) descriptors).IsFixedSize, testCase + "#10");
#endif

			try {
				list.Add (desc);
				Assert.Fail (testCase + "#11");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			// ensure read-only check if performed before value is checked
			try {
				list.Add (null);
				Assert.Fail (testCase + "#12");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				list.Clear ();
				Assert.Fail (testCase + "#13");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				list.Insert (0, desc);
				Assert.Fail (testCase + "#14");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			// ensure read-only check if performed before value is checked
			try {
				list.Insert (0, null);
				Assert.Fail (testCase + "#15");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				list.Remove (desc);
				Assert.Fail (testCase + "#16");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			// ensure read-only check if performed before value is checked
			try {
				list.Remove (null);
				Assert.Fail (testCase + "#17");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				list.RemoveAt (0);
				Assert.Fail (testCase + "#18");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			try {
				list[0] = desc;
				Assert.Fail (testCase + "#19");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}

			// ensure read-only check if performed before value is checked
			try {
				list[0] = null;
				Assert.Fail (testCase + "#20");
			} catch (NotSupportedException) {
				// read-only collection cannot be modified
			}
		}