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POUnable to hold value into Global variable from a Windows Form in a C# DLL
 

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  1. POUnable to hold value into Global variable from a Windows Form in a C# DLL
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    <p>I have a DLL which has the API calls for certain Trade related functions (getAccounts, getPositions, CreateOrders etc). Most of the API calls require an Access Token in order to get the required functionality. The Access Token is obtained by showing a Windows Form to the user which takes input and sets the Access Token on a button click event. I have my Global variable for the access token set in the following class:</p> <pre><code>namespace TradeAddin { public sealed class MyConstants { //User Access Token public static string user_token; } } </code></pre> <p>I am setting the value for the above token as <code>MyConstants.user_token = strAccessToken;</code> from the Form <code>btSubmitAuthCode_Click</code> event that I have added to the Solution as follows:</p> <pre><code> namespace TradeAddin { public partial class TradeLoginAuthForm : Form { public TradeLoginAuthForm () { InitializeComponent(); btSubmitAuthCode.Enabled = false; } private void btSubmitAuthCode_Click(object sender, EventArgs e) { string strAuthCode = txtAuthCode.Text.Trim(); string strAccessToken = TradeApiCalls.getAccessToken(strAuthCode); if (strAccessToken != null) { MyConstants.user_token = strAccessToken; this.Close(); } else { MessageBox.Show("Invalid Authorization Code. Please ReEnter!", "Trade Exception: Invalid Authorization Code", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void txtAuthCode_TextChanged(object sender, EventArgs e) { btSubmitAuthCode.Enabled = !(txtAuthCode.Text.Trim() == String.Empty); } } } </code></pre> <p>I close the Windows Form after getting the AccessToken. Now when I initiate other API calls (From DLL initialize method) that require AccessToken, I get <code>null</code> returned for AccessToken variable which I am using for the below API Calls:</p> <pre><code>namespace TradeAddIn { public class TradeApiCalls { public string getAccounts() { if (string.IsNullOrEmpty(MyConstants.user_token)) { TradeLoginAuthForm TradeForm = new TradeLoginAuthForm (); TradeForm.Show(); } string URI = "https://api.trade.com/a1/account/id"; using (WebClient client = new WebClient()) { client.Headers[HttpRequestHeader.Authorization] = "Bearer " + MyConstants.user_token; </code></pre> <p>How do I retain the value of the Global variable in order to access it later? Any help is greatly appreciated.</p>
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    1. USaceventura
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    1. COdo you mean retaining the value of the Global variable through application restart? So that it will be available after your apps exit, on reopend by user?
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      1. POUnable to hold value into Global variable from a Windows Form in a C# DLL
      1. UShar07
    2. COInfact, this DLL is used in a third party Windows application. When a user wants to access the AddIn functionality, then he clicks on the 3rd party app's Connection Button which opens the Windows Form. The Access Token is requested by entering an Auth Code as explained in my question and the Form is closed. Now, as long as the user is logged-in, he should have access to that Global variable. But, when I try to access the Account window of the 3rd party application which should get the Account details by making an API call to my DLL, the Token variable is NULL.
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      1. POUnable to hold value into Global variable from a Windows Form in a C# DLL
      1. USaceventura
    3. COYou should save your data somewhere else like Windows Registry, file, or database and retrieved it when your API loaded into clients memory. If you don't save the data then no matter what you do, you will always loose the data every time your DLL/API is disposed since it is only residing in physical memory.
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      1. POUnable to hold value into Global variable from a Windows Form in a C# DLL
      1. USJade
 

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