private void Form1_Load(object sender, EventArgs e)
{
//============ 1. 基本覆寫ToString() 格式化 + IFormattable 格式化(可帶參數的字串格式化)
classA objA = new classA();
classPerson objB = new classPerson()
{
IDCode = "H333456789", FirstName = "王", LastName = "小明"
};
//Class資訊(類別資訊)
var resultA = objA.ToString();
//王 小明
var resultB = objB.ToString("Ch", null);
//小明 王
var resullC = objB.ToString("Eg", null);
//王 小明
var resullD = objB.ToString();
//============= 2. 使用格式化器的方法
classPerson objC = new classPerson()
{
FirstName = "王", LastName = "大明", IDCode = "H333456790"
};
classPersonFormatter cpFormatter = new classPersonFormatter();
//王 大明
var result_objC_A = objC.ToString();
//王 大明
var result_objC_B = cpFormatter.Format("Ch", objC, null);
//大明 王
var resull_objC_C = cpFormatter.Format("Eg", objC, null);
//王 大明 : H333456790
var resull_objC_D = cpFormatter.Format("ChM", objC, null);
//============ 結合 1. 2.的方法
classPersonCombination objD =
new classPersonCombination()
{
FirstName = "王", LastName = "超明", IDCode = "H333456791"
};
classPersonFormatter cp2Formatter = new classPersonFormatter();
//王 超明
var result_objD_A = objD.ToString();
//王 超明
var result_objD_B = objD.ToString("Ch", cp2Formatter);
//超明 王
var resull_objD_C = objD.ToString("Eg", cp2Formatter);
//王 超明 : H333456791
var resull_objD_D = objD.ToString("ChM", cp2Formatter);
}
/// <summary>
/// 覆寫classPersonCombination 於外部呼叫ToString()的方法
/// </summary>
/// <param name="format"></param>
/// <param name="formatProvider"></param>
/// <returns></returns>
public string ToString(string format, IFormatProvider formatProvider)
{
switch (format)
{
case "Ch":
//東方名字 姓 + 名 ※已於classPersonCombination內部覆寫
return(this.ToString());
case "Eg":
//西方名字 名 + 姓
return(string.Format("{0} {1}", this.LastName, this.FirstName));
case "ChM":
//完整資訊
return(string.Format("{0} {1} : {2}", this.FirstName, this.LastName, IDCode));
default:
//善用 IFormatProvider 格式化器
classPersonFormatter myCustomFormatter = formatProvider as classPersonFormatter;
//如果沒有格式化器，則回傳我們覆寫的ToString()
if (myCustomFormatter == null)
{
return(this.ToString());
}
else
{
return(myCustomFormatter.Format(format, this, null));
}
}
}