在类型的对象上找不到C#属性

错误：

未处理System.Configuration.SettingsPropertyNotFoundException 未找到设置属性自定义设置

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编辑完全误解了要求。如果您试图在运行时创建此设置，请稍后再次阅读，以下是代码更改：

//ensures no runtime errors if you try and view the setting before its created
private bool _customSettingExists = false;
public Form1()
{
    InitializeComponent();
}

private void radButton1_Click(object sender, EventArgs e)
{
    //You're saving your CustomSetting to properties, so you should read it from Default.Properties
    if (_customSettingExists)
        radTextBox1.Text = Properties.Settings.Default.Properties["CustomSetting"].ToString();
}

private void radButton2_Click(object sender, EventArgs e)
{
    System.Configuration.SettingsProperty property = new
    System.Configuration.SettingsProperty("CustomSetting");
    property.SerializeAs = SettingsSerializeAs.Xml;
    property.DefaultValue = "Default";
    property.IsReadOnly = false;
    property.PropertyType = typeof(string);
    property.Provider =
    Properties.Settings.Default.Providers["LocalFileSettingsProvider"];

    property.Attributes.Add(typeof(System.Configuration.UserScopedSettingAttribute), new System.Configuration.UserScopedSettingAttribute());
    Properties.Settings.Default.Properties.Add(property);

    // Load settings now.

    Properties.Settings.Default.Reload();

    // Update the user itnerface.

    Properties.Settings.Default.Properties["CustomSetting"] = radTextBox1.Text;
    Properties.Settings.Default.Save();

    //now that you know a custom setting exists
    _customSettingExists = true;
}

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错误发生在哪一行？radTextBox1.Text=（string）Properties.Settings.Default[“CustomSetting”]；启动程序时会出现错误。当我尝试将文本加载到radTextBox1.text时，我认为您的应用程序无法读取设置文件。以下是一个可能的答案：。另外，检查它是否存在。帮帮我！不起作用，错误（文件user FFFFFFFF Your app.config的内容看起来正确。这是否反映在Addsettings项目中？如果转到项目属性并单击“设置”选项卡，是否所有设置都正确？app.config如何在用户创建自定义设置时进行设置，已在app.confi中创建。）您是否试图在运行时创建此自定义设置？但在编译时没有？

//ensures no runtime errors if you try and view the setting before its created
private bool _customSettingExists = false;
public Form1()
{
    InitializeComponent();
}

private void radButton1_Click(object sender, EventArgs e)
{
    //You're saving your CustomSetting to properties, so you should read it from Default.Properties
    if (_customSettingExists)
        radTextBox1.Text = Properties.Settings.Default.Properties["CustomSetting"].ToString();
}

private void radButton2_Click(object sender, EventArgs e)
{
    System.Configuration.SettingsProperty property = new
    System.Configuration.SettingsProperty("CustomSetting");
    property.SerializeAs = SettingsSerializeAs.Xml;
    property.DefaultValue = "Default";
    property.IsReadOnly = false;
    property.PropertyType = typeof(string);
    property.Provider =
    Properties.Settings.Default.Providers["LocalFileSettingsProvider"];

    property.Attributes.Add(typeof(System.Configuration.UserScopedSettingAttribute), new System.Configuration.UserScopedSettingAttribute());
    Properties.Settings.Default.Properties.Add(property);

    // Load settings now.

    Properties.Settings.Default.Reload();

    // Update the user itnerface.

    Properties.Settings.Default.Properties["CustomSetting"] = radTextBox1.Text;
    Properties.Settings.Default.Save();

    //now that you know a custom setting exists
    _customSettingExists = true;
}