title: How to change OxyPlot Y-Axis string format?
body: <p>Can anyone tell me how to change the Y axis string format??</p>
  
  <p>I have Y-Axis percentages that I want to add the percent sign to.</p>
  
  <p>I am using OxyPlot to produce the chart in wpf.</p>
  
  <p>Here is my attempt, but it is NOT working:</p>
  
  <pre><code>Func&lt;double, string&gt; formatFunc = (x) =&gt; string.Format("{000.00}%", x);
  
          formatFunc = new Func&lt;double,string&gt;("{0}");
          // Add the plot to the window
          line.YAxis.LabelFormatter = formatFunc;
  </code></pre>
  
  <p>This produces null reference error.</p>
  
  <p>Thanks!</p>