qr code generator api c# Exploring the System Namespace in Visual C#

Creating QR-Code in Visual C# Exploring the System Namespace

Exploring the System Namespace
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static void Main() { string str = "This is a test $23"; int i; for(i=0; i < strLength; i++) { ConsoleWrite(str[i] + " is"); if(CharIsDigit(str[i])) ConsoleWrite(" digit"); if(CharIsLetter(str[i])) ConsoleWrite(" letter"); if(CharIsLower(str[i])) ConsoleWrite(" lowercase"); if(CharIsUpper(str[i])) ConsoleWrite(" uppercase"); if(CharIsSymbol(str[i])) ConsoleWrite(" symbol"); if(CharIsSeparator(str[i])) ConsoleWrite(" separator"); if(CharIsWhiteSpace(str[i])) ConsoleWrite(" whitespace"); if(CharIsPunctuation(str[i])) ConsoleWrite(" punctuation"); ConsoleWriteLine(); } ConsoleWriteLine("Original: " + str); // Convert to uppercase string newstr = ""; for(i=0; i < strLength; i++) newstr += CharToUpper(str[i]); ConsoleWriteLine("Uppercased: " + newstr); } }
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PART II
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T h i s i s a t e s t is is is is is is is is is is is is is is is letter uppercase letter lowercase letter lowercase letter lowercase separator whitespace letter lowercase letter lowercase separator whitespace letter lowercase separator whitespace letter lowercase letter lowercase letter lowercase letter lowercase punctuation
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Part II:
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Exploring the C# Library
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is separator whitespace $ is symbol 2 is digit 3 is digit Original: This is a test $23 Uppercased: THIS IS A TEST $23
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The Boolean Structure
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The Boolean structure supports the bool data type The methods defined by Boolean are shown in Table 21-10 It defines these fields: public static readonly string FalseString public static readonly string TrueString These contain the human-readable forms of true and false For example, if you output FalseString using a call to WriteLine( ), the string False is displayed Boolean implements the following interfaces: IComparable, IComparable<bool>, IConvertible, and IEquatable<bool>
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Method public int CompareTo(bool v) Meaning Compares the value of the invoking object with that of v Returns zero if the values are equal Returns a negative value if the invoking object is false and v is true Returns a positive value if the invoking object is true and v is false Compares the value of the invoking object with that of v Returns zero if the values are equal Returns a negative value if the invoking object is false and v is true Returns a positive value if the invoking object is true and v is false Returns true if the value of the invoking object equals the value of v Returns true if the value of the invoking object equals the value of v Returns the hash code for the invoking object Returns the TypeCode enumeration value for Boolean, which is TypeCodeBoolean Returns the bool equivalent of the string in str If the string is neither BooleanTrueString nor BooleanFalseString, a FormatException is thrown However, case differences are ignored Returns the string representation of the value of the invoking object, which will be either TrueString or FalseString Returns the string representation of the value of the invoking object, which will be either TrueString or FalseString The fmtpvdr parameter is ignored
public int CompareTo(object v)
public bool Equals(bool v) public override bool Equals(object v) public override int GetHashCode( ) public TypeCode GetTypeCode( ) public static bool Parse(string str)
public override string ToString( ) public string ToString(IFormatProvider fmtpvdr)
TABLE 21-10 Methods De ned by Boolean
21:
Exploring the System Namespace
Method public static bool TryParse(string str, out bool b)
Meaning Attempts to convert the character in str into its bool equivalent If successful, the value is stored in b and true is returned If the string is neither BooleanTrueString nor BooleanFalseString, false is returned (Case differences are ignored) This differs from Parse( ), which throws an exception on failure
TABLE 21-10 Methods De ned by Boolean (continued)
PART II
The Array Class
One very useful class in System is Array Array is a base class for all arrays in C# Thus, its methods can be applied to arrays of any of the built-in types or to arrays of types that you create Array defines the properties shown in Table 21-11 It defines the methods shown in Table 21-12 Array implements the following interfaces: ICloneable, ICollection, IEnumerable, and IList ICollection, IEnumerable, and IList are defined in the SystemCollections namespace and are described in 24 Several methods use a parameter of type IComparer or IComparer<T> The IComparer interface is in SystemCollections It defines a method called Compare( ), which compares the values of two objects It is shown here: int Compare(object v1, object v2) It returns greater than zero if v1 is greater than v2, less than zero if v1 is less than v2, and zero if the two values are equal IComparer<T> is in SystemCollectionsGeneric It defines a generic form of Compare( ), which is shown here: int Compare(T v1, T v2) It works the same as its non-generic relative: returning greater than zero if v1 is greater than v2, less than zero if v1 is less than v2, and zero if the two values are equal The advantage to IComparer<T> is type safety, because the type of data being operated upon is explicitly specified Thus, no casts from object are required The next few sections demonstrate several commonly used array operations
Property public bool IsFixedSize { get; } public bool IsReadOnly { get; } public bool IsSynchronized { get; } Meaning A read-only property that is true if the array is of fixed size and false if the array is dynamic This value is true for arrays A read-only property that is true if the Array object is read-only and false if it is not This value is true for arrays A read-only property that is true if the array is safe for use in a multithreaded environment and false if it is not This value is true for arrays
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