使用設定檔案的方法：
private bool GetBool(string keyname)
{
string radiobutton1 = optionsfile.GetKey(keyname);
bool b;
bool.TryParse(radiobutton1.Trim(), out b);
return b;
}
例外是在 radiobutton1 上，因為 settings.txt 檔案不存在。
表格頂部的選項檔案1
private OptionsFile optionsfile = new OptionsFile(Path.GetDirectoryName(Application.LocalUserAppDataPath) "\\Settings.txt");
和 OptionsFile 類，在里面我首先檢查檔案是否存在。所以我做錯了什么。因為如果我在 OptionsFile 類中檢查它，為什么我需要檢查它是否也存在于所有其他地方？
有點亂。
/*----------------------------------------------------------------
* Module Name : OptionsFile
* Description : Saves and retrievs application options
* Author : Danny
* Date : 10/02/2010
* Revision : 1.00
* --------------------------------------------------------------*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Configuration;
/*
* Introduction :
*
* This module helps in saving application options
*
*
* Typical file could look like this:
* user_color=Red
* time_left=30
*
*
*
*
*
* */
namespace DannyGeneral
{
class OptionsFile
{
/*----------------------------------------
* P R I V A T E V A R I A B L E S
* ---------------------------------------*/
/*---------------------------------
* P U B L I C M E T H O D S
* -------------------------------*/
string path_exe;
string temp_settings_file;
string temp_settings_dir;
string Options_File;
StreamWriter sw;
StreamReader sr;
/*----------------------------------------------------------
* Function : OptionsFile
* Description : Constructor
* Parameters : file_name is the name of the file to use
* Return : none
* --------------------------------------------------------*/
///<summary>
///<para>Enter a path with a filename</para>
///</summary>
public OptionsFile(string settingsFileAndPath)
{
if (!File.Exists(settingsFileAndPath))
{
if (!Directory.Exists(Path.GetDirectoryName(settingsFileAndPath)))
{
Directory.CreateDirectory(Path.GetDirectoryName(settingsFileAndPath));
}
File.Create(settingsFileAndPath).Close();
}
path_exe = Path.GetDirectoryName(Application.LocalUserAppDataPath);
Options_File = settingsFileAndPath;
}
/*----------------------------------------------------------
* Function : GetKey
* Description : gets the value of the key.
* Parameters : key
* Return : value of the key if key exist, null if not exist
* --------------------------------------------------------*/
public string GetKey(string key)
{
// string value_of_each_key;
string key_of_each_line;
string line;
int index;
string key_value;
key_value = null;
sr = new StreamReader(Options_File);
while (null != (line = sr.ReadLine()))
{
index = line.IndexOf("=");
// value_of_each_key = line.Substring(index 1);
if (index >= 1)
{
key_of_each_line = line.Substring(0, index);
if (key_of_each_line == key)
{
key_value = line.Substring(key.Length 1);
}
}
else
{
}
}
sr.Close();
return key_value;
}
/*----------------------------------------------------------
* Function : SetKey
* Description : sets a value to the specified key
* Parameters : key and a value
* Return : none
* --------------------------------------------------------*/
public void SetKey(string key , string value)
{
bool key_was_found_inside_the_loop;
string value_of_each_key;
string key_of_each_line ;
string line;
int index;
key_was_found_inside_the_loop = false;
temp_settings_file = "\\temp_settings_file.txt";
temp_settings_dir = path_exe @"\temp_settings";
if (!Directory.Exists(temp_settings_dir))
{
Directory.CreateDirectory(temp_settings_dir);
}
sw = new StreamWriter(temp_settings_dir temp_settings_file);
sr = new StreamReader(Options_File);
while (null != (line = sr.ReadLine()))
{
index = line.IndexOf("=");
key_of_each_line = line.Substring(0, index);
value_of_each_key = line.Substring( index 1);
// key_value = line.Substring(0,value.Length);
if (key_of_each_line == key)
{
sw.WriteLine(key "=" value);
key_was_found_inside_the_loop = true;
}
else
{
sw.WriteLine(key_of_each_line "=" value_of_each_key);
}
}
if (!key_was_found_inside_the_loop)
{
sw.WriteLine(key "=" value);
}
sr.Close();
sw.Close();
File.Delete(Options_File);
File.Move(temp_settings_dir temp_settings_file, Options_File);
return;
}
public List<float> GetListFloatKey(string keys)
{
List<float> result = new List<float>();
string s = GetKey(keys);
if (s != null)
{
string[] items = s.Split(new char[] { ',' });
float f;
foreach (string item in items)
{
if (float.TryParse(item, out f))
result.Add(f);
}
return result;
}
else
{
return result;
}
}
public void SetListFloatKey(string key, List<float> Values)
{
StringBuilder sb = new StringBuilder();
foreach (float value in Values)
{
sb.AppendFormat(",{0}", value);
}
if (Values.Count == 0)
{
SetKey(key, "");
}
else
{
SetKey(key, sb.ToString().Substring(1));
}
}
public List<int> GetListIntKey(string keys)
{
/*List<int> t = new List<int>();
t = (GetListFloatKey(keys).ConvertAll(x => (int)x));
return t;*/
List<int> result = new List<int>();
string s = GetKey(keys);
if (s != null)
{
string[] items = s.Split(new char[] { ',' });
int f;
foreach (string item in items)
{
if (int.TryParse(item, out f))
result.Add(f);
}
return result;
}
else
{
return result;
}
;
}
public void SetListIntKey(string key, List<int> Values)
{
StringBuilder sb = new StringBuilder();
foreach (int value in Values)
{
sb.AppendFormat(",{0}", value);
}
if (Values.Count == 0)
{
SetKey(key, "");
}
else
{
SetKey(key, sb.ToString().Substring(1));
}
}
/*---------------------------------
* P R I V A T E M E T H O D S
* -------------------------------*/
}
}
uj5u.com熱心網友回復：
該檔案存在。
檔案中不存在 keyname 的值。
這會導致optionesfile.GetKey(keyname)回傳 null。
要防止錯誤并仍然回傳有效值，請檢查radiobutton1它是否為 null并將初始值分配給b.
private bool GetBool(string keyname)
{
string radiobutton1 = optionsfile.GetKey(keyname);
bool b = false; // set initial value;
if( radiobutton /* != null */ )
bool.TryParse(radiobutton1.Trim(), out b);
return b;
}
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標籤：C＃表格