using System;
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using System.Collections.Specialized;
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namespace BatchService.Framework.Utility
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{
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/// <summary>
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/// 配置文件appSettings节点的帮助方法
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/// </summary>
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public class AppSettingsHelper {
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private static readonly NameValueCollection appSettings;
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static AppSettingsHelper() {
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appSettings = System.Configuration.ConfigurationManager.AppSettings; ;
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}
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public static bool GetBoolValue(string key)
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{
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bool value = false;
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if (appSettings[key] != null)
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bool.TryParse(appSettings[key], out value);
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return value;
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}
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public static int GetIntValue(string key)
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{
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int value = 0;
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if (appSettings[key] != null)
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int.TryParse(appSettings[key], out value);
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return value;
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}
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#region GetString
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的字符串类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <returns>字符串</returns>
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public static string GetString(string key) {
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return getValue(key, true, null);
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的字符串类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>字符串</returns>
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public static string GetString(string key, string defaultValue) {
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return getValue(key, false, defaultValue);
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}
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#endregion
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#region GetStringArray
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的string[]类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="separator">分隔符</param>
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/// <returns>字符串数组</returns>
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public static string[] GetStringArray(string key, string separator) {
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return getStringArray(key, separator, true, null);
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的string[]类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="separator">分隔符</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>字符串数组</returns>
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public static string[] GetStringArray(string key, string separator, string[] defaultValue) {
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return getStringArray(key, separator, false, defaultValue);
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的string[]类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="separator">分隔符</param>
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/// <param name="valueRequired">指定配置文件中是否必须需要配置有该名称的元素，传入False则方法返回默认值，反之抛出异常</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>字符串数组</returns>
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private static string[] getStringArray(string key, string separator, bool valueRequired, string[] defaultValue) {
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string value = getValue(key, valueRequired, null);
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if (!string.IsNullOrEmpty(value))
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return value.Split(new[] { separator }, StringSplitOptions.RemoveEmptyEntries);
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else if (!valueRequired)
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return defaultValue;
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throw new ApplicationException("在配置文件的appSettings节点集合中找不到key为" + key + "的子节点，且没有指定默认值");
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}
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#endregion
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#region GetInt32
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的Int类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <returns>Int</returns>
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public static int GetInt32(string key) {
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return getInt32(key, null);
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的Int类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>Int</returns>
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public static int GetInt32(string key, int defaultValue) {
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return getInt32(key, defaultValue);
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的Int类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>Int</returns>
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private static int getInt32(string key, int? defaultValue) {
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return getValue<int>(key, (v, pv) => int.TryParse(v, out pv), defaultValue);
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}
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#endregion
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#region GetBoolean
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的布尔类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <returns>布尔值</returns>
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public static bool GetBoolean(string key) {
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return getBoolean(key, null);
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的布尔类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>布尔值</returns>
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public static bool GetBoolean(string key, bool defaultValue) {
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return getBoolean(key, defaultValue);
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的布尔类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>布尔值</returns>
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private static bool getBoolean(string key, bool? defaultValue) {
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return getValue<bool>(key, (v, pv) => bool.TryParse(v, out pv), defaultValue);
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}
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#endregion
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#region GetTimeSpan
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的时间间隔类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <returns>时间间隔</returns>
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public static TimeSpan GetTimeSpan(string key) {
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return TimeSpan.Parse(getValue(key, true, null));
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}
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/// <summary>
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/// 获取配置文件中appSettings节点下指定索引键的时间间隔类型的的值
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/// </summary>
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/// <param name="key">索引键</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>时间间隔</returns>
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public static TimeSpan GetTimeSpan(string key, TimeSpan defaultValue) {
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string val = getValue(key, false, null);
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if (val == null)
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return defaultValue;
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return TimeSpan.Parse(val);
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}
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#endregion
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#region Private Methods
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/// <summary>
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/// 获取配置文件appSettings集合中指定索引的值
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/// </summary>
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/// <typeparam name="T">返回值类型参数</typeparam>
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/// <param name="key">索引键</param>
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/// <param name="parseValue">将指定索引键的值转化为返回类型的值的委托方法</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns></returns>
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private static T getValue<T>(string key, Func<string, T, bool> parseValue, T? defaultValue) where T : struct {
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string value = appSettings[key];
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if (value != null) {
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T parsedValue = default(T);
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if (parseValue(value, parsedValue))
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return parsedValue;
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else
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throw new ApplicationException(string.Format("Setting '{0}' was not a valid {1}", key, typeof(T).FullName));
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}
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if (!defaultValue.HasValue)
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throw new ApplicationException("在配置文件的appSettings节点集合中找不到key为" + key + "的子节点，且没有指定默认值");
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else
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return defaultValue.Value;
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}
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/// <summary>
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/// 获取配置文件appSettings集合中指定索引的值
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/// </summary>
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/// <param name="key">索引</param>
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/// <param name="valueRequired">指定配置文件中是否必须需要配置有该名称的元素，传入False则方法返回默认值，反之抛出异常</param>
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/// <param name="defaultValue">默认值</param>
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/// <returns>字符串</returns>
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private static string getValue(string key, bool valueRequired, string defaultValue) {
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string value = appSettings[key];
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if (value != null)
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return value;
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else if (!valueRequired)
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return defaultValue;
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throw new ApplicationException("在配置文件的appSettings节点集合中找不到key为" + key + "的子节点");
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}
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#endregion
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}
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}
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