I added a strongly-typed DataSet object to my project. It's type name is DocRetrieverDataSet
.
I also have in my project settings a row for a user-scope DataSet property named DocRetrieverDataSource to which I want to save an instance of DocRetrieverDataSet
.
Here is boiled-down code:
using Settings = MyProjectNameSpace.Properties.Settings;
....
private DocRetrieverDataSet myDocRetrieverDataSet;
public myForm()
{
Initialize();
if (Settings.Default.DocRetrieverDataSource == null)
{
Settings.Default.DocRetrieverDataSource = new DocRetrieverDataSet();
Settings.Default.Save();
}
this.myDocRetrieverDataSet = (DocRetrieverDataSet)Settings.Default.DocRetrieverDataSource;
}
The first time I run it, when Settings.Default.DocRetrieverDataSource
is null
, it works fine! However, when I run it the second time, I get an InvalidCastException
at
this.myDocRetrieverDataSet = (DocRetrieverDataSet)Settings.Default.DocRetrieverDataSource;
It says
Unable to cast object of type 'System.Data.DataSet' to type 'DocRetriever.DocRetrieverDataSet'.
The funny thing is that it doesn't have this problem the first time around. What is going on and how can I fix it?
MORE INFO:
Here's the relevant code from Settings.Designer.cs
[global::System.Configuration.UserScopedSettingAttribute()]
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
public global::System.Data.DataSet DocRetrieverDataSource {
get {
return ((global::System.Data.DataSet)(this["DocRetrieverDataSource"]));
}
set {
this["DocRetrieverDataSource"] = value;
}
}
And from app.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=abcdefghijkl" >
<section name="DocRetriever.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=abcdefghijkl" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
</sectionGroup>
</configSections>
<userSettings>
<DocRetriever.Properties.Settings>
<setting name="SpoolDirectoryPath" serializeAs="String">
<value />
</setting>
<setting name="OutputDirectoryPath" serializeAs="String">
<value />
</setting>
</DocRetriever.Properties.Settings>
</userSettings>
</configuration>