qr code c# open source Exploring the System Namespace in Visual C#.NET

Generation QR Code in Visual C#.NET Exploring the System Namespace

Exploring the System Namespace
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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], CultureInfoCurrentCulture); ConsoleWriteLine("Uppercased: " + newstr); } }
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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 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 separator whitespace symbol
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Exploring the C# Library
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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 value) Meaning Compares the value of the invoking object with that of value Returns zero if the values are equal Returns a negative value if the invoking object is false and value is true Returns a positive value if the invoking object is true and value is false Compares the value of the invoking object with that of obj Returns zero if the values are equal Returns a negative value if the invoking object is false and obj is true Returns a positive value if the invoking object is true and obj is false Returns true if the value of the invoking object equals the value of obj Returns true if the value of the invoking object equals the value of obj 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 value 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 provider parameter is ignored Attempts to convert the string in value into its bool equivalent If successful, the value is stored in result 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
public int CompareTo(object obj)
public bool Equals(bool obj) public override bool Equals(object obj) public override int GetHashCode( ) public TypeCode GetTypeCode( ) public static bool Parse(string value)
public override string ToString( ) public string ToString(IFormatProvider provider) public static bool TryParse(string value, out bool result)
TABLE 21-10
Methods De ned by Boolean
21:
Exploring the System Namespace
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, IStructuralComparable, IStructuralEquatable, and IList All but ICloneable 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 x, object y) It returns greater than zero if x is greater than y, less than zero if x is less than y, 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 x, T y) It works the same as its non-generic relative: returning greater than zero if x is greater than y, less than zero if x is less than y, 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
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