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Update SiteMapNode.cs #335

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Update SiteMapNode.cs #335

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3 changes: 2 additions & 1 deletion src/MvcSiteMapProvider/MvcSiteMapProvider/SiteMapNode.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -721,12 +721,13 @@ protected virtual IDictionary<string, object> MergeRouteValuesAndNamedQueryStrin
// Add any query string values from the current context
var queryStringValues = httpContext.Request.QueryString;

//QueryString collection might contains nullable keys
foreach (var key in queryStringValues.AllKeys)
{
// Copy the query string value as a route value if it doesn't already exist
// and the name is provided as a match. Note that route values will take
// precedence over query string parameters in cases of duplicates.
if (queryStringKeys.Contains(key) && !result.ContainsKey(key))
if (key!=null && queryStringKeys.Contains(key) && !result.ContainsKey(key))
{
result[key] = queryStringValues[key];
}
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