如果選擇日期不可用，則顯示未來30天的結果？

Question

我們向用戶展示搜索特定日期的記錄或按日期範圍搜索的選項。

但是，如果用戶選擇的日期不可用，而不是顯示未找到用戶選擇的消息，則會顯示接下來30天的記錄。

到目前爲止，我的查詢顯示的日期比今天早。

這是錯誤的。

任何想法下面的代碼有什麼問題？

If ViewSelect = "Range" Then 
    sb.Append(If(startedWhere, andors, " WHERE ")) 
    sb.Append("(CONVERT(VARCHAR(10), facilityAvailabilityDate, 101) >= @FromDate And CONVERT(VARCHAR(10), facilityAvailabilityDate, 101) <= @EndDate)") 
    cmd.Parameters.AddWithValue("@FromDate", txtFromDate.Text) 
    cmd.Parameters.AddWithValue("@EndDate", txtToDate.Text) 
    startedWhere = True 

ElseIf ViewSelect = "Specific" Then 
    sb.Append(If(startedWhere, andors, " WHERE ")) 
    sb.Append("(CONVERT(VARCHAR(10), facilityAvailabilityDate, 101) = @SpecificDate)") 
    cmd.Parameters.AddWithValue("@SpecificDate", txtSpecificDate.Text) 
    startedWhere = True 
End If 

cmd.CommandText = sb.ToString() 
'Response.Write(sb) 
'Response.End() 
' Dim cmd As New SqlCommand(strQuery) 
Dim dt As DataTable = GetData(cmd) 

'No records found, so display records for next 30 days. 
If dt.Rows.Count = 0 Then 

    cmd.Parameters.Clear() 
    cmd.Parameters.AddWithValue("@FromDate", Date.Today.AddMonths(-1)) 
    cmd.Parameters.AddWithValue("@EndDate", Date.Today.ToString("MM/dd/yyyy")) 

    cmd.CommandText = "Select siteID,siteName,bldgName,Capacity,AvailableFacilities,facilityAvailabilityDate,Status " & _ 
",amenities,[Rental Fees] RentalFees,[Extra Hour Fees] ExtraHourFees,[Deposit Fees] DepositFees,[Cancellation Fees] CancelFees,[Key Deposit Fees] KeyDepFees, Duration " & _ 
" FROM ParksNRecsData" & _ 
" where facilityAvailabilityDate Between @FromDate And @EndDate" 
    dt = GetData(cmd) 
End If 

GridView1.DataSource = dt 
GridView1.DataBind() 

SQL Server是選擇的數據庫。

在此先感謝

Answer 1

的代碼塊是從上月選擇日期，而不是下個月：

If dt.Rows.Count = 0 Then 

    cmd.Parameters.Clear() 
    cmd.Parameters.AddWithValue("@FromDate", Date.Today.AddMonths(-1)) 
    cmd.Parameters.AddWithValue("@EndDate", Date.Today.ToString("MM/dd/yyyy")) 

像下面改變的東西應該達到你想要的東西：

If dt.Rows.Count = 0 Then 

    cmd.Parameters.Clear() 
    cmd.Parameters.AddWithValue("@FromDate", Date.Today) 
    cmd.Parameters.AddWithValue("@EndDate", Date.Today.AddMonths(1))