你可以自行修改這個文件，以適應不同銀行的貸款利率。
這個文件由 Config.cs 文件中的 Config 類讀取：
using System;
using System.XML;
using System.Drawing;
using System.Collections.Generic;
namespace Skyiv.Ben.LoanCalculator
{
sealed class Config
{
static readonly string ElmOption = "option";
static readonly string ElmItems = "items";
static readonly string AttrBalance = "balance";
static readonly string AttrMonths = "months";
static readonly string AttrDate = "date";
static readonly string AttrMethod = "method";
static readonly string AttrItem = "item";
static readonly string AttrTitle = "title";
static readonly string AttrLow = "low";
static readonly string AttrHigh = "high";
public decimal Balance { get; private set; } // 貸款金額(萬元)
public int Months { get; private set; } // 貸款期數(月)
public DateTime Date { get; private set; } // 貸款日期
public bool IsEq { get; private set; } // 還款方式: true:等本息 false: 等本金
public string Item { get; private set; } // 貸款種類
public string[] Items { get; private set; } // 貸款種類列表
public KeyValuePair<DateTime, PointF>[] Rates { get; private set; } // 貸款利率
KeyValuePair<DateTime, PointF>[][] ratesArray; // 各種類的“貸款利率”列表
public Config(string fileName)
{
try
{
var doc = new XMLDocument();
doc.Load(fileName);
var elm = doc.DocumentElement[ElmOption];
if (elm == null) throw new Exception("未能找到 <" + ElmOption + "> 元素");
Balance = GetDecimal(elm, AttrBalance);
Months = GetInt32(elm, AttrMonths);
Date = GetDateTime(elm, AttrDate);
IsEq = GetBooleanFromMethod(elm, AttrMethod);
Item = GetString(elm, AttrItem);
Items = GetItemsAndLoadRatesArray(doc);
SetRates(Item);
}
catch (Exception ex)
{
throw new Exception("讀配置文件(" + fileName + ")", ex);
}
}
// 根據貸款種類設置貸款利率
public void SetRates(string key)
{
var idx = Array.IndexOf(Items, key);
if (idx < 0) throw new Exception("無此貸款種類: " + key);
Rates = ratesArray[idx];
}
string[] GetItemsAndLoadRatesArray(XMLDocument doc)
{
var elm = doc.DocumentElement[ElmItems];
if (elm == null) throw new Exception("未能找到 <" + ElmItems + "> 元素");
var elms = elm.ChildNodes;
var items = new string[elms.Count];
ratesArray = new KeyValuePair<DateTime, PointF>[elms.Count][];
for (var i = 0; i < elms.Count; i++)
{
items[i] = GetString(elms[i], AttrTitle);
ratesArray[i] = GetRates(elms[i]);
}
return items;
}
KeyValuePair<DateTime, PointF>[] GetRates(XMLNode elm)
{
var elms = elm.ChildNodes;
var rates = new KeyValuePair<DateTime, PointF>[elms.Count];
for (var i = 0; i < elms.Count; i++)
rates[i] = new KeyValuePair<DateTime, PointF>(GetDateTime(elms[i], AttrDate),
new PointF(GetFloat(elms[i], AttrLow), GetFloat(elms[i], AttrHigh)));
return rates;
}
string GetString(XMLNode elm, string key)
{
if (elm.Attributes[key] == null) throw new Exception("未能找到 <" + elm.Name + "> 元素的 " + key + " 屬性");
return elm.Attributes[key].Value;
}
float GetFloat(XMLNode elm, string key)
{
float value;
if (!float.TryParse(GetString(elm, key), out value))
throw new Exception("<" + elm.Name + "> 元素的 " + key + " 屬性的值必須為浮點數");
return value;
}
decimal GetDecimal(XMLNode elm, string key)
{
decimal value;
if (!decimal.TryParse(GetString(elm, key), out value))
throw new Exception("<" + elm.Name + "> 元素的 " + key + " 屬性的值必須為實數");
return value;
}
int GetInt32(XMLNode elm, string key)
{
int value;
if (!int.TryParse(GetString(elm, key), out value))
throw new Exception("<" + elm.Name + "> 元素的 " + key + " 屬性的值必須為整數");
return value;
}
DateTime GetDateTime(XMLNode elm, string key)
{
DateTime value;
if (!DateTime.TryParseExact(GetString(elm, key), "yyyy-MM-dd", null, System.Globalization.DateTimeStyles.None, out value))
throw new Exception("<" + elm.Name + "> 元素的 " + key + " 屬性的值必須為日期值");
return value;
}
bool GetBooleanFromMethod(XMLNode elm, string key)
{
var value = GetString(elm, key);
if (value == "等本息") return true;
if (value == "等本金") return false;
throw new Exception("<" + elm.Name + "> 元素的 " + key + " 屬性的值必須為“等本息”或者“等本金”");
}
}
}
