open source qr code library vb.net Jeff <B>123</B> January 23 in VS .NET

Draw QR-Code in VS .NET Jeff <B>123</B> January 23

Jeff <B>123</B> January 23
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In Main, I m constructing an empty StringBuilder and then appending a formatted string into it . When I call AppendFormat, the first parameter is an instance of the BoldInt32s class . This class implements the IFormatProvider interface that I discussed earlier . In addition, this class implements the ICustomFormatter interface:
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public interface ICustomFormatter { String Format(String format, Object arg, IFormatProvider formatProvider); }
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This interface s Format method is called whenever StringBuilder s AppendFormat needs to obtain a string for an object . You can do some pretty clever things inside this method that give you a great deal of control over string formatting . Let s look inside the AppendFormat method to see exactly how it works . The following pseudocode shows how AppendFormat works:
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public StringBuilder AppendFormat(IFormatProvider formatProvider, String format, params Object[] args) { // If an IFormatProvider was passed, find out // whether it offers an ICustomFormatter object. ICustomFormatter cf = null; if (formatProvider != null) cf = (ICustomFormatter) formatProvider.GetFormat(typeof(ICustomFormatter)); // Keep appending literal characters (not shown in this pseudocode) // and replaceable parameters to the StringBuilder's character array. Boolean MoreReplaceableArgumentsToAppend = true; while (MoreReplaceableArgumentsToAppend) { // argFormat refers to the replaceable format string obtained // from the format parameter String argFormat = /* ... */; // argObj refers to the corresponding element // from the args array parameter Object argObj = /* ... */; // argStr will refer to the formatted string to be appended // to the final, resulting string String argStr = null; // If a custom formatter is available, let it format the argument. if (cf != null) argStr = cf.Format(argFormat, argObj, formatProvider); // If there is no custom formatter or if it didn't format // the argument, try something else. if (argStr == null) { // Does the argument's type support rich formatting IFormattable formattable = argObj as IFormattable; if (formattable != null) { // Yes; pass the format string and provider to // the type's IFormattable ToString method. argStr = formattable.ToString(argFormat, formatProvider); } else { // No; get the default format by using // the thread's culture information. if (argObj != null) argStr = argObj.ToString(); else argStr = String.Empty; } } // Append argStr's characters to the character array field member. /* ... */ // Check if any remaining parameters to format MoreReplaceableArgumentsToAppend = /* ... */; } return this; }
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When Main calls AppendFormat, AppendFormat calls my format provider s GetFormat method, passing it the ICustomFormatter type . The GetFormat method defined in my BoldInt32s type sees that the ICustomFormatter is being requested and returns a reference to itself because it implements this interface . If my GetFormat method is called and is passed any other type, I call the GetFormat method of the CultureInfo object associated with the calling thread . Whenever AppendFormat needs to format a replaceable parameter, it calls ICustomFormatter s Format method . In my example, AppendFormat calls the Format method defined by my BoldInt32s type . In my Format method, I check whether the object being formatted supports rich formatting via the IFormattable interface . If the object doesn t, I then call the simple, parameterless ToString method (inherited from Object) to format the object . If the object does support IFormattable, I then call the rich ToString method, passing it the format string and the format provider . Now that I have the formatted string, I check whether the corresponding object is an Int32 type, and if it is, I wrap the formatted string in <B> and </B> HTML tags and return the new string . If the object is not an Int32, I simply return the formatted string without any further processing .
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