SemanticValue.ContainsKey(String) 方法

public:
 virtual bool ContainsKey(System::String ^ key);

public bool ContainsKey(string key);

abstract member ContainsKey : string -> bool
override this.ContainsKey : string -> bool

Public Function ContainsKey (key As String) As Boolean

参数

返回

如果找到带有字符串bool标记的子实例true，则返回一个，SemanticValue否则返回一个keyfalse。

实现

示例

以下示例演示用于处理命令以更改前景和背景色的事件的处理程序 SpeechRecognized 。

处理识别但没有语义结构的短语后，处理程序会检查是否存在 ContainsKey 适当的键（applyChgToBackground或 colorRGBValueList，或 colorStringList)，然后处理语义上组织的数据）。

newGrammar.SpeechRecognized +=
  delegate(object sender, SpeechRecognizedEventArgs eventArgs)
  {

    // Retrieve the value of the semantic property.
    bool changeBackGround = true;
    string errorString = "";
    SemanticValue semantics = eventArgs.Result.Semantics;

    Color newColor = Color.Empty;

    try
    {
      if (semantics.Count == 0 && semantics.Value==null)
      {

        // Signifies recognition by a grammar with no semantics.
        // Parse the string, assuming that the last word is color,
        // searching for background or foreground in input.
        if (eventArgs.Result.Text.Contains("foreground"))
        {
          changeBackGround = false;
        }
        string cName = eventArgs.Result.Words[eventArgs.Result.Words.Count - 1].Text;
        newColor = Color.FromName(cName);

      }
      else if (semantics.ContainsKey("colorStringList") ^ semantics.ContainsKey("colorRGBValueList"))
      {

        // Determine whether to change background or foreground.
        if (semantics.ContainsKey("applyChgToBackground"))
        {
          changeBackGround = semantics["applyChgToBackground"].Value is bool;
        }

        // Get the RGB color value.
        if (semantics.ContainsKey("colorStringList"))
        {
          newColor = Color.FromName((string)semantics["colorStringList"].Value);
        }
        if (semantics.ContainsKey("colorRGBValueList"))
        {
          newColor = System.Drawing.Color.FromArgb((int)semantics["colorRGBValueList"].Value);
        }
      }
      else
      {

        // Throw an exception if the semantics do not contain the keys we
        // support.
        throw(new Exception("Unsupported semantics keys found."));
      }
    }

    catch (Exception exp)
    {
      MessageBox.Show(String.Format("Unable to process color semantics.:\n{0}\n", exp.Message));
      return;
    }

    // Change colors, either foreground or background.
    if (changeBackGround)
    {
      BackColor = newColor;
      float Bright = BackColor.GetBrightness();
      float Hue = BackColor.GetHue();
      float Sat = BackColor.GetSaturation();
      // Make sure that text is readable regardless of background.
      if (BackColor.GetBrightness() <= .50)
      {
        ForeColor = Color.White;
      }
      else
      {
        ForeColor = Color.Black;
      }
    }
    else
    {
      ForeColor = newColor;
      float Bright = ForeColor.GetBrightness();
      float Hue = ForeColor.GetHue();
      float Sat = ForeColor.GetSaturation();
      // Make sure that text is readable regardless of Foreground.
      if (ForeColor.GetBrightness() <= .50)
      {
        BackColor = Color.White;
      }
      else
      {
        BackColor = Color.Black;
      }
    }
    return;
  };

注解

只能在运行时按键值访问数据，例如检查 语义[“myKey”]。值，这将生成异常。 建议在与给定实例ContainsKey一Item[]起使用之前查询对象SemanticValue。