我想对接收功率值为2.77的进行特殊显示，代码是按api写的，程序运行无错，但是不起作用，如何解决？ 

private void Form1_Load(object sender, EventArgs e)         {              string selectstr = string.Format("SELECT phonenum as '终端号',rssi as '信号强度' FROM dbo.SONDemoSystemTable");             using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["sondemosystem"].ConnectionString))             {                 con.Open();                 SqlDataAdapter adapter = new SqlDataAdapter(selectstr, con);                 DataSet sourceDataSet = new DataSet();                 adapter.Fill(sourceDataSet, "SONDemoSystemTable");                 pivotGridControl1.DataSource = sourceDataSet.Tables["SONDemoSystemTable"];                 PivotGridField fieldPhone = new PivotGridField("终端号", PivotArea.FilterArea);                 PivotGridField fieldReceivePower = new PivotGridField("接收功率", PivotArea.FilterArea);    pivotGridControl1.Fields.AddRange(new PivotGridField[] {fieldPhone,fieldReceivePower });              

                PivotGridStyleFormatCondition fCondition = new PivotGridStyleFormatCondition();                fCondition.Field = fieldReceivePower;                fCondition.ApplyToCustomTotalCell = false;                fCondition.ApplyToGrandTotalCell = false;                fCondition.ApplyToTotalCell = false;                fCondition.Condition = DevExpress.XtraGrid.FormatConditionEnum.Equal;                             fCondition.Value1 = 2.77;                fCondition.Appearance.BackColor = Color.Red;                fCondition.Appearance.Font = new Font(fCondition.Appearance.Font, FontStyle.Bold);                fCondition.Appearance.Options.UseBackColor = true;                fCondition.Appearance.Options.UseFont = true;                             pivotGridControl1.FormatConditions.AddRange(new DevExpress.XtraPivotGrid.PivotGridStyleFormatCondition[] { fCondition });          } }