private string GetStringValue(DCExpressionItem item, IDCExpressionContext context)
{
if (item == null)
{
return(null);
}
object v = item.Eval(context);
return(DCExpression.ToString(v));
}
private double GetDoubleValue(DCExpressionItem item, IDCExpressionContext context, double defaultValue = 0)
{
if (item == null)
{
return(defaultValue);
}
object v = item.Eval(context);
return(DCExpression.ToDouble(v, defaultValue));
}
private bool GetBooleanValue(DCExpressionItem item, IDCExpressionContext context, bool defaultValue = false)
{
if (item == null)
{
return(defaultValue);
}
object v = item.Eval(context);
return(DCExpression.ToBoolean(v));
}
/// <summary>
/// 复制对象
/// </summary>
/// <returns>复制品</returns>
public DCExpression Clone()
{
DCExpression result = (DCExpression)this.MemberwiseClone();
if (this._RootItem != null)
{
result._RootItem = this._RootItem.Clone();
}
return(result);
}
private void toolStripButton1_Click(object sender, EventArgs e)
{
DCTokenList tokens = new DCTokenList(cboExpression.Text);
StringBuilder result = new StringBuilder();
for (int iCount = 0; iCount < tokens.Count; iCount++)
{
result.AppendLine(iCount.ToString("00") + ":" + tokens[iCount].ToString());
}
DCExpression exp = new DCExpression(cboExpression.Text);
result.AppendLine(exp.ToDebugString());
MyContext c = new MyContext();
object vresult = exp.Eval(c);
result.AppendLine("运算结果:" + vresult);
txtResult.Text = result.ToString();
}