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  SendKeys模拟键盘的操作，设置一定的键值，便可以自动控制。但是我们在使用的过程中，发现SendKeys不支持空格键，在很多的应用场景，都需要使用空格键，所以只好通过反射的方式将其调整。
代码如下：

            Type typeForKeywords = Type.GetType("System.Windows.Forms.SendKeys+KeywordVk[], System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");

            Type typeForKeywordItem = Type.GetType("System.Windows.Forms.SendKeys+KeywordVk, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");
            object objNewKey = Activator.CreateInstance(typeForKeywordItem, "SPACE", 0x20);

            Type typeForSendKeys = typeof(SendKeys);

            FieldInfo fieldForkeywords = typeForSendKeys.GetField("keywords", BindingFlags.NonPublic | BindingFlags.GetField | BindingFlags.Static);
            object objKeys = fieldForkeywords.GetValue(null);

            Type typeForlistForKeyword = Type.GetType("System.Collections.Generic.List`1[[System.Windows.Forms.SendKeys+KeywordVk, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");
            object objForTmpKeyWords = Activator.CreateInstance(typeForlistForKeyword);

            MethodInfo mi = typeForlistForKeyword.GetMethod("Add");

            foreach (object var in (Array)objKeys)
            {
                //list.Add(var);
                mi.Invoke(objForTmpKeyWords, new object[] { var });
            }

            //list.Add(key);
            mi.Invoke(objForTmpKeyWords, new object[] { objNewKey });