测试String.Format方法

     [Test]
        public void TestMethod6()
        {
            string A = "A";
            string B = "B";
            string C = "C";
            string D = "{0}";
            String str = String.Format(D, A, B, C);
            Assert.AreEqual(str, "A");
            str = String.Format("{1}", A, B, C);
            Assert.AreEqual(str, "B");
            str = String.Format("{2}", A, B, C);
            Assert.AreEqual(str, "C");
        }