为什么我的列表< string>不救？ [英] Why my list<string> doesn´t save?

问题描述

美好的一天，我有一个清单< string>保存在我的应用程序用户设置中，此列表应该保存openfiledialog的文件路径然后反序列化它，但我已经调用方法Save（）;甚至方法Upgrade（）;将字符串添加到列表后，但此字符串不会保存。为什么？



我尝试过：



保存它：

private void ImportIcon_Click（object sender，EventArgs e）

{

IfSound（）;

openFileDialog1.Filter =Analytica Files（* .analy）| * .analy;

openFileDialog1.Multiselect = true;

if（openFileDialog1.ShowDialog（）== DialogResult.OK）

{

var Path = openFileDialog1.FileName;

foreach（openFileDialog1.FileNames中的字符串文件）

{

Settings.Default.FileList.Add（file）;

Settings.Default.Save（）;

//Settings.Default.Upgrade （）;

}

Good Day, I Have A List<string> Saved In My App User Settings, this List is supposed to save the file paths of a openfiledialog to then deserialize it, but I already Called the method Save(); And even the method Upgrade(); After adding the strings to the list, but this strings doesn´t save. Why?

What I have tried:

To Save It:
private void ImportIcon_Click(object sender, EventArgs e)
{
IfSound();
openFileDialog1.Filter = "Analytica Files (*.analy) |*.analy";
openFileDialog1.Multiselect = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
var Path = openFileDialog1.FileName;
foreach (string file in openFileDialog1.FileNames)
{
Settings.Default.FileList.Add(file);
Settings.Default.Save();
//Settings.Default.Upgrade();
}

推荐答案

检查设置类型。没有自定义处理程序，无法更新应用程序设置 - 参考; 应用程序设置概述| Microsoft Docs [ ^ ]

使用调试器，如果设置已定义但未初始化，则为null&你无法为它添加值 - 打击代码在测试应用程序中工作 - 值通过重新启动应用程序 - 创建一个名为 TestList 的用户设置进行测试;

Check the Setting Type. Application Settings cannot be updated without a custom handler - refer; Application Settings Overview | Microsoft Docs[^]
Use your debugger, if the setting is defined but not initialised, it will be null & you cannot add values to it - the blow code works in a Test application - the values are carried over restarts of the application - create a User Setting named TestList to test;

if(Properties.Settings.Default.TestList == null)
    {
        MessageBox.Show("Not initialised");
    // Create a new List and Save to Settings        
    Properties.Settings.Default.TestList = new System.Collections.Specialized.StringCollection();
        Properties.Settings.Default.Save();
    }
    else if(Properties.Settings.Default.TestList.Count > 0)
    {
        // Create a message showing the last value in the list and the count of items
        string strMsg = string.Format("List is populated\r\nLast Value: {0}\r\nCount: {1}", Properties.Settings.Default.TestList[Properties.Settings.Default.TestList.Count - 1].ToString(), Properties.Settings.Default.TestList.Count.ToString());
           
    MessageBox.Show(strMsg);
    }
    else
    {
        MessageBox.Show("Currently empty");
    }

    string[] myTest = new string[] { "Value 1", "Value 2" };
    
    foreach(string myVal in myTest)
    {
        Properties.Settings.Default.TestList.Add(myVal);
    }
    Properties.Settings.Default.Save();

    if (Properties.Settings.Default.TestList.Count > 0)
    {
        MessageBox.Show("After populate\r\n" + Properties.Settings.Default.TestList[0].ToString()
            + "\r\nCount: " + Properties.Settings.Default.TestList.Count);
    }

亲切的问候

Kind Regards

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