C # Methods for judging whether two strings are equal, and the char assignment null method.

1     stringstr1="Test"; 2               stringSTR2 ="Test"; 3               if(STR1==STR2)//The first way of judging4               {  5                   //The second way of judging6                   intRESULT1 =Str1.compareto (STR2); 7Console.WriteLine (RESULT1);//Output result1=08       9                   //The Third Way of judgingTen                   intResult2=String.Compare (str1, str2);  OneConsole.WriteLine (RESULT2);//Output result2=0 A        -                  //the following two ways to be aware that str1 and str2 are not NULL cases -        the                   //The Fourth way of judging -                   BOOLresult3=str1.  Equals (STR2);  -Console.WriteLine (RESULT3);//Output Result3=true -        +                   //The fifth way of judging -                   BOOLRESULT4 =string.equals (STR1,STR2);  +Console.WriteLine (RESULT4);//Output Result4=true A}

Note: String.Compare The meaning of the comparison result:

Value	Meaning
less than 0	x is less than y. or x is a null reference (Nothing in Visual Basic).
0	x equals y.
greater than 0	x greater than y. or y is a null reference (Nothing in Visual Basic).

String. The meaning of the equals comparison result is:

Value	Meaning
True	x equals y.
False	x does not equal Y.

Char a = null, or char a = ' ' is all wrong to define a null value. The following methods are summarized: the values are all 0.

1             stringSTR1 =NULL;2Console.WriteLine ("str1 = {0}", str1);//show null values and "" similar3             /*4 * The variable value of char below is all 05              */6 7             CharTest =' /';8             intNUM1 =Convert.tochar (test);9Console.WriteLine ("NUM1 = {0}", NUM1);Ten  One             CharTest1 =Char. MinValue; A             intnum2 =Convert.tochar (test1); -Console.WriteLine ("num2 = {0}", num2); -  the             CharTest2 = (Char)0; -             intNUM3 =Convert.tochar (test2); -Console.WriteLine ("num3 = {0}", num3); -  +             CharTest3 = Convert.tochar (0); -             intNUM4 =Convert.tochar (test3); +Console.WriteLine ("num4 = {0}", NUM4); A  at             CharTest4 = ((Char?)NULL). GetValueOrDefault (); -             intNUM5 =Convert.tochar (test4); -Console.WriteLine ("NUM5 = {0}", NUM5);//the values are all 0 . -              -Console.readkey ();

C # Methods for judging whether two strings are equal, and the char assignment null method.