今天跟大家講一下如何在DXperience Winforms Subscription文本編輯器中自定義字符格式。一個是字符串格式的大小寫轉換，一個是將十進制的值以二進制的形式顯示。

字符串的大小寫格式轉換

本示例創建一個自定義格式化，以修改編輯器的文本。編輯器的顯示文本遵循指定的格式字符串，這個字符串傳遞給Format方法作為格式參數。如果這個參數值為"u"，顯示值會轉換為大寫，如果格式字符串為"l"，顯示值將轉換為小寫。示例代碼如下：

// A custom formatter object.
class CustomFormatter : IFormatProvider, ICustomFormatter{
    // The GetFormat method of the IFormatProvider interface.
    // This must return an object that provides formatting services for the specified type.
    public object GetFormat(System.Type type){
        return this;
    }
    // The Format method of the ICustomFormatter interface.
    // This must format the specified value according to the specified format settings.
    public string Format(string format, object arg, IFormatProvider formatProvider){
        string formatValue = arg.ToString();
        if (format == "u")
            return formatValue.ToUpper();
        else if (format == "l")
            return formatValue.ToLower();
        else return formatValue;
    }
}
// ...
// Assign the custom formatter to the editors.
textEdit1.Properties.DisplayFormat.FormatType = FormatType.Custom;
textEdit1.Properties.DisplayFormat.FormatString = "u";
textEdit1.Properties.DisplayFormat.Format = new CustomFormatter();

textEdit2.Properties.DisplayFormat.FormatType = FormatType.Custom;
textEdit2.Properties.DisplayFormat.FormatString = "l";
textEdit2.Properties.DisplayFormat.Format = new CustomFormatter();

轉換前和轉換后的文本編輯器字符串：

以二進制顯示十進制值

本示例演示如何創建自定義格式化對象，用二進制顯示十進制的值。如圖：

示例代碼如下：

// A custom formatter object.
public class BaseFormatter : IFormatProvider, ICustomFormatter {
    // The GetFormat method of the IFormatProvider interface.
    // This must return an object that provides formatting services for the specified type.
    public object GetFormat(Type format) {
        if (format == typeof (ICustomFormatter)) return this;
        else return null;
    }
    // The Format method of the ICustomFormatter interface.
    // This must format the specified value according to the specified format settings.
    public string Format (string format, object arg, IFormatProvider provider) {
        if (format == null) {
            if (arg is IFormattable)
                return ((IFormattable)arg).ToString(format, provider);
            else
                return arg.ToString(); 
        }
        if (format == "B")
            return Convert.ToString(Convert.ToInt32(arg), 2);
        else
            return arg.ToString();
    }
}

// ...
// Assign the custom formatter to the editor.
spinEdit1.Properties.DisplayFormat.FormatType = FormatType.Custom;
spinEdit1.Properties.DisplayFormat.FormatString = "B";
spinEdit1.Properties.DisplayFormat.Format = new BaseFormatter();
spinEdit1.Properties.IsFloatValue = false;
spinEdit1.EditValue = 10;