System.Xml.Xsl.XsltOld.XsltCompileContext.EvaluateVariable C# (CSharp) Method

        internal object EvaluateVariable(VariableAction variable) {
            Object result = this.processor.GetVariableValue(variable);
            if (result == null && ! variable.IsGlobal) {
                // This was uninitialized local variable. May be we have sutable global var too?
                VariableAction global = this.manager.VariableScope.ResolveGlobalVariable(variable.Name);
                if (global != null) {
                    result = this.processor.GetVariableValue(global);
                }
            }
            if (result == null) {
                throw XsltException.Create(Res.Xslt_InvalidVariable, variable.Name.ToString());
            }
            return result;
        }