In my previous post I mentioned that I also wanted to use the CredentialPicker from Nintex to include in my own custom activity and since of this week I finally managed to achieve this! ;)

What is the CredentialPicker? This picker allows you to set an username and password combination so that an activity can be ran using those credentials. But you can also use a lookup to a workflow constant credential that can be defined on web / site / web application level. So it’s like the SPSecurity.RunWithElevatedPriviliges method but then in a workflow activity. So I think you can see the potential of this control.. In an activity it looks like this :

Doesn’t look that spectacular eh? But.. it’s very powerful.. very.. 

So how do we get this awesome little control in our dialog page?

1. Add the UserControl declarative in the header of the page

   <%@ Register TagPrefix="Nintex" TagName="CredentialControl" Src="~/_layouts/NintexWorkflow/CredentialControl.ascx" %>

2. Add the javascript code to retrieve the current set values using the TPARetrieveConfig method
   

   function TPARetrieveConfig() {           
       if (configXml.selectSingleNode("/NWActionConfig/Parameters/Parameter[@Name='Username']") && configXml.selectSingleNode("/NWActionConfig/Parameters/Parameter[@Name='Password']")) {
           cc_setUsername("<%= credentialPicker.ClientID %>", configXml.selectSingleNode("/NWActionConfig/Parameters/Parameter[@Name='Username']/PrimitiveValue/@Value").text);
           cc_setPassword("<%= credentialPicker.ClientID %>", configXml.selectSingleNode("/NWActionConfig/Parameters/Parameter[@Name='Password']/PrimitiveValue/@Value").text);
       }
   }

3. Add the javacsript to write the current value set using the TPAWriteConfig method
   

   function TPAWriteConfig() {          
       EnsurePrimitiveValueNode(configXml, "Username");
       EnsurePrimitiveValueNode(configXml, "Password");
       configXml.selectSingleNode("/NWActionConfig/Parameters/Parameter[@Name='Username']/PrimitiveValue/@Value").text = cc_getUsername("<%= credentialPicker.ClientID %>");
       configXml.selectSingleNode("/NWActionConfig/Parameters/Parameter[@Name='Password']/PrimitiveValue/@Value").text = cc_getPassword("<%= credentialPicker.ClientID %>");
       return true;
   }

4. And then we add the UserControl in the ContentPlaceHolder
   

    <Nintex:CredentialControl RequiredField="true" DisplayMode="dialog" CssClass="ms-input"
           Width="170px" runat="server" id="credentialPicker">
       </Nintex:CredentialControl>

5. To get the credentials in codebehind in the CodeActivity use this

string runtimeUsername = string.Empty;
string runtimePassword = string.Empty;
CredentialValue.DetermineRuntimeCredentials(
this.Username, //UserName Property
this.Password,  //Password Property
out runtimeUsername, 
out runtimePassword, 
ctx.Web.ID, 
ctx.Web.Site.ID);
NetworkCredential credentials = null;
if (runtimeUsername.Contains(@"\"))
{
   string[] strArray = 
        runtimeUsername.Split(new char[] { '\\' });
   credentials = 
        new NetworkCredential(strArray[1], runtimePassword, strArray[0]);
}
else
{
   credentials = new NetworkCredential(runtimeUsername, runtimePassword);
}