private IEnumerable<string> ExpandEnvironmentVariables(Control control, string text)
{
Func<string, bool> predicate = null;
int num = 0;
int length = -1;
for (int i = 0; i < text.Length; i++)
{
if (text[i] == '%')
{
length = i;
num++;
}
}
if ((num % 2) == 1)
{
string b = text.Substring(0, length);
if (!string.Equals(this.LastEnvironemntVariablesSource, b, StringComparison.OrdinalIgnoreCase))
{
this.LastEnvironemntVariablesSource = b;
try
{
PreviewEnvironmentVariableEventArgs args = null;
this.LastEnvironmentVariablesCollection = new List<string>();
foreach (string str2 in Environment.GetEnvironmentVariables().Keys)
{
PreviewEnvironmentVariableEventArgs e = args ?? (args = new PreviewEnvironmentVariableEventArgs(control));
e._Value = str2;
e.Cancel = false;
this.OnPreviewEnvironmentVariable(e);
if (!e.Cancel)
{
this.LastEnvironmentVariablesCollection.Add(string.Concat(new object[] { b, '%', str2, '%' }));
}
}
this.LastEnvironmentVariablesCollection.TrimExcess();
}
catch
{
this.LastEnvironmentVariablesCollection = null;
}
}
if (this.LastEnvironmentVariablesCollection != null)
{
if (predicate == null)
{
predicate = delegate (string x) {
return x.StartsWith(text, StringComparison.OrdinalIgnoreCase);
};
}
return this.LastEnvironmentVariablesCollection.Where<string>(predicate);
}
}
return new string[0];
}
protected virtual void OnPreviewEnvironmentVariable(PreviewEnvironmentVariableEventArgs e)
{
EventHandler<PreviewEnvironmentVariableEventArgs> handler = base.Events[EventPreviewEnvironmentVariable] as EventHandler<PreviewEnvironmentVariableEventArgs>;
if (handler != null)
{
handler(this, e);
}
}
public static void PreviewEnvironmentVariable(object sender, PreviewEnvironmentVariableEventArgs e)
{
switch (e.Value)
{
case "curdir":
case "curitempath":
case "curitemname":
case "curselname":
case "curselpath":
case "fardir":
case "faritempath":
case "faritemname":
case "farselname":
case "farselpath":
case "user":
e.Cancel = true;
break;
}
}
