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When the Format method parses the format string, it sees that replaceable parameter 0 should have its IFormattable interface s ToString method passing "D" and null for its two parameters. Likewise, Format calls replaceable parameter 2 s IFormattable ToString method, passing "E" and null. If the type doesn t implement the IFormattable interface, then Format calls its parameterless ToString method and the general format is appended into the resulting string. The String class offers several overloads of the static Format method. One version takes an object that implements the IFormatProvider interface so that you can format all the replaceable parameters using caller specified culture information. Obviously, Format calls each object s ToString method, passing it whatever IFormatProvider object was passed to Format. If you re using StringBuilder instead of String to construct a string, you can call StringBuilder s AppendFormat method. This method works exactly like String s Format method except that it formats a string and appends to the StringBuilder s character array. Like String s Format, AppendString takes a format string, and there s a version that takes an IFormatProvider. System.Console offers Write and WriteLine methods that also take format strings and replaceable parameters. However, there are no overloads of Console s Write and WriteLine methods that allow you to pass an IFormatProvider. If you want to format a string for a specific culture, you have 225
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to call String s Format method, first passing the desired IFormatProvider object and then passing the resulting string to Console s Write or WriteLine method. This shouldn t be a big deal since, as I said earlier, it s rare for client side code to format a string using a culture other than the one associated with the calling thread.
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By now it should be clear that the formatting capabilities in the .NET Framework were designed to offer you a great deal of flexibility and control. However, we re not quite done. It s possible for you to define a method that StringBuilder s AppendFormat method will call whenever any object is being formatted into a string. In other words, instead of calling ToString for each object, AppendFormat can call a function that you define, allowing you to format any or all of the objects any way you want. What I m about to describe works only when calling StringBuilder s AppendFormat method. String s Format method doesn t support this mechanism. Let me explain this mechanism by way of an example. Let s say that you re formatting HTML text that a user will view in an Internet browser. You want all Int32 values to display in bold. To accomplish this, every time an Int32 value is formatted into a String, you want to surround the string with HTML bold tags: <B> and </B>. The following code demonstrates how easy it is to do this:
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using using using using System; System.Text; System.Globalization; System.Threading;
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class BoldInt32s : IFormatProvider, ICustomFormatter { public Object GetFormat(Type formatType) { if (formatType == typeof(ICustomFormatter)) return this; return Thread.CurrentThread.CurrentCulture.GetFormat(formatType); } public String Format(String format, Object arg, IFormatProvider formatProvider) { String s; IFormattable formattable = arg as IFormattable; if (formattable == null) s = arg.ToString(); else s = formattable.ToString(format, formatProvider); if (arg.GetType() == typeof(Int32)) return "<B>" + s + "</B>"; return s; } }
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class App { static void Main() { StringBuilder sb = new StringBuilder(); sb.AppendFormat(new BoldInt32s(), "{0} {1} {2:M}", "Jeff", 123, DateTime.Now); Console.WriteLine(sb); } }
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When you compile and run this code, it displays the following output:
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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:
public interface ICustomFormatter { String Format(String format, Object arg, IFormatProvider formatProvider); }
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 does its stuff:
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. while (MoreReplaceableArgumentsToAppend) { String argStr; // Formatted argument string to append // 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 = arg 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 general format using // the thread s culture information. if (arg != null) argStr = arg.ToString(); else s = String.Empty; } } // Append argStr s characters to the character array field member. ... } return this;
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 its own object. If any other type is requested of GetFormat, I call the GetFormat method using 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, this 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, then I call the simple, parameterless ToString method to format the object. If the object doesn t support IFormattable, then I 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 object is an Int32 type, and if it is, I wrap the formatting string in <B> and </B> HTML tags and return the new string. If the object is not an Int32, then I simply return the formatted string without any further processing.
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