我的 List.Add 中的数据为 Null
Data is Null in my case in my List.Add
我收到以下代码的错误，该代码是为显示 table 数据编写的
Data is Null. This method or property cannot be called on Null values.
这是我的代码，您可以帮我调查一下。
public static List<NomsPRRequest> LoadPRfromDB_withParams(DateTime from, DateTime to, string EntityID,
string DepartmentID)
{
string sScript = m_sReport + ((EntityID == "") ? "" : " AND d.[EntityID]=" + EntityID) + ((DepartmentID == "") ? "" : " AND d.[DepartmentID]=" + DepartmentID)
+ " and [RequestDate] between '" + from.ToString("yyyy-MM-dd HH:mm:ss") + "' and '" + to.ToString("yyyy-MM-dd HH:mm:ss") + "'";
Dictionary<long, NomsPRRequest> data = new Dictionary<long, NomsPRRequest>();
long key;
double dAmount;
using (SqlConnection con = new SqlConnection(m_sConnectionString))
{
con.Open();
using (SqlCommand command = new SqlCommand(sScript, con))
{
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
key = reader.GetInt64(0);
if (!data.ContainsKey(key))
{
data.Add(key, new NomsPRRequest()
{
RequestID = key,
RequestDate = reader.GetDateTime(1),
PARNumber = reader.GetString(2),
DepartmentName = reader.GetString(10),
DepartmentID = reader.GetInt64(11),
StatusID = reader.GetInt64(3),
FullName = reader.GetString(7),
InboxLearUID = reader.GetString(12),
ProgramName = reader.GetString(14),
ItemList = new List<NomsPRItem>(),
TotalAmount = 0.0
});
}
dAmount = (double)reader.GetDecimal(21) * (double)reader.GetDecimal(22);
data[key].TotalAmount += dAmount;
****data[key].ItemList.Add(new NomsPRItem()****
{
RequestID = key,
PartDesc = reader.GetString(17),
PartNumber = reader.GetString(23),
SupplierID = reader.GetString(18),
FullName = reader.GetString(7),
AccountType = reader.GetString(19),
CurrName = reader.GetString(20),
PartQuantity = (double)reader.GetDecimal(21),
PiecePrice = (double)reader.GetDecimal(22),
Amount = dAmount
});
}
}
}
return data.Values.ToList();
}
我在这部分遇到错误
data[key].ItemList.Add(new NomsPRItem()
这是我的看法..
<table data-ng-show="models != null" class="table table-striped table-bordered table-hover"
id="PRTable" >
<tr class="titlerow">
<th>
<a href="#" data-ng-click="sorting='RequestDate'; reverse = !reverse">PR Date <span
data-ng-show="sorting == 'RequestDate'"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='RequestID '; reverse = !reverse">PR # <span data-ng-show="sorting == 'RequestID '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='PARNumber '; reverse = !reverse">PAR # <span
data-ng-show="sorting == 'PARNumber '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='ProgramName '; reverse = !reverse">Program <span
data-ng-show="sorting == 'ProgramName '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='FullName '; reverse = !reverse">Requestor <span
data-ng-show="sorting == 'FullName '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='DepartmentName '; reverse = !reverse">Department <span
data-ng-show="sorting == 'FullName '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='PONo'; reverse = !reverse">PO #
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='StatusID '; reverse = !reverse">PRStatus<span
data-ng-show="sorting == 'StatusID '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='Amount '; reverse = !reverse">Total Amount<span
data-ng-show="sorting == 'Amount '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='InboxLearUID '; reverse = !reverse">Last Action<span
data-ng-show="sorting == 'InboxLearUID '"></span>
</a>
</th>
</tr>
<tr data-ng-repeat="model in models | orderBy: sorting:reverse | filter : filterAllColumns | filter : filterOptions ">
<td>{{jsonDatetotext(model.RequestDate) | date:'MM/dd/yyyy'}}</td>
<td>
<a href="#" data-toggle="modal" data-target="#basicModalContent" data-ng-click="getSelectedPR(model)">{{model.RequestID}}
</a>
</td>
<td>{{model.PARNumber }}</td>
<td>{{model.ProgramName }}</td>
<td>{{model.FullName }}</td>
<td>{{model.DepartmentName | uppercase}}</td>
<td>{{model.PONo}}</td>
<td>{{StatusList[model.StatusID] | uppercase}}</td>
<td class="totalAmount"><span class="pull-right">{{model.TotalAmount | number:2}}</span>
</td>
<td>{{model.InboxLearUID | lowercase}}</td>
</tr>
</table>
</div>
<!-- /.Modal Na ni -->
<div class="modal fade" id="basicModalContent" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"
aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
</div>
<div class="modal-body" id="exportablePRItems">
<div class="table-responsive">
<table class="table table-striped table-bordered table-hover" id="dataTables-example">
<thead>
<tr>
<th>Item Code
</th>
<th>Item Description
</th>
<th>Supplier
</th>
<th>Account
</th>
<th>Currency
</th>
<th>Amount
</th>
<th>(USD) Amount
</th>
</tr>
</thead>
<tbody data-ng-repeat="selectedPR in selectedModal.ItemList">
<tr>
<td>{{selectedPR.PartNumber}}</td>
<td>{{selectedPR.PartDesc}}</td>
<td>{{selectedPR.SupplierID }}</td>
<td>{{selectedPR.AccountType}}</td>
<td>{{selectedPR.CurrName }}</td>
<td data-ng-model="amount" class="amount">{{selectedPR.Amount | number:2}}</td>
<td>{{selectedPR.AmountUSD}}</td>
</tr>
</tbody>
<tr>
<td><span class="pull-right"><i class="glyphicon glyphicon-plus-sign"></i></span></td>
<td colspan="3"><b>{{selectedModal.RequestID}}</b> </td>
<td colspan="1"><b>Total : </b></td>
<td colspan="2">{{selectedModal.ItemList | sumbykey : 'Amount' | number:2}}</td>
</tr>
</table>
</div>
<footer>
<br />
<button data-ng-click="exportDataItems()" class="btn btn-warning"><i class="glyphicon glyphicon-export"></i>Export Item </button>
</footer>
</div>
<div class="modal-footer">
<button id="btnModalCancel" type="button" class="btn btn-default" data-dismiss="modal">
Close</button>
</div>
</div>
</div>
</div>
</div>
</div>
任何人都可以帮助我调查这些代码，以便我可以继续我的下一步吗？
我认为问题在于将十进制类型转换为双精度类型。
如果 21 和 22 的值 return DbNull 那么你不能将该类型转换为 double。我建议：
- 确保索引 21 和 22 处的值 return 有效的十进制数。您可以在 sql 查询中使用 IsNull() 函数来执行此操作。
- 如果您的目的是获得双精度值，请尝试使用 reader.GetDouble(21) 和 reader.GetDouble(22) 而不是类型转换。
或者，您可以通过将该对象初始化代码提取为更小的部分来进行一些调试：
var npri = new NomsPRItem();
npri.RequestID = key;
npri.PartDesc = reader.GetString(17);
npri.PartNumber = reader.GetString(23);
npri.SupplierID = reader.GetString(18);
npri.FullName = reader.GetString(7);
npri.AccountType = reader.GetString(19);
npri.CurrName = reader.GetString(20);
npri.PartQuantity = (double)reader.GetDecimal(21);
npri.PiecePrice = (double)reader.GetDecimal(22);
npri.Amount = dAmount;
这将指出导致问题的确切列索引。
最好使用 IsDBNull .. 就像这个：
RequestID = key,
PartDesc = reader.IsDBNull(17) ? null : reader.GetString(17),
PartNumber = reader.IsDBNull(23) ? null : reader.GetString(23),
SupplierID = reader.IsDBNull(18) ? null : reader.GetString(18),
FullName = reader.IsDBNull(7) ? null : reader.GetString(7),
AccountType = reader.IsDBNull(19) ? null : reader.GetString(19),
CurrName = reader.IsDBNull(20) ? null : reader.GetString(20),
PartQuantity = (double)reader.GetDecimal(21),
PiecePrice = (double)reader.GetDecimal(22),
Amount = dAmount
希望能帮到你
我收到以下代码的错误，该代码是为显示 table 数据编写的
Data is Null. This method or property cannot be called on Null values.
这是我的代码，您可以帮我调查一下。
public static List<NomsPRRequest> LoadPRfromDB_withParams(DateTime from, DateTime to, string EntityID,
string DepartmentID)
{
string sScript = m_sReport + ((EntityID == "") ? "" : " AND d.[EntityID]=" + EntityID) + ((DepartmentID == "") ? "" : " AND d.[DepartmentID]=" + DepartmentID)
+ " and [RequestDate] between '" + from.ToString("yyyy-MM-dd HH:mm:ss") + "' and '" + to.ToString("yyyy-MM-dd HH:mm:ss") + "'";
Dictionary<long, NomsPRRequest> data = new Dictionary<long, NomsPRRequest>();
long key;
double dAmount;
using (SqlConnection con = new SqlConnection(m_sConnectionString))
{
con.Open();
using (SqlCommand command = new SqlCommand(sScript, con))
{
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
key = reader.GetInt64(0);
if (!data.ContainsKey(key))
{
data.Add(key, new NomsPRRequest()
{
RequestID = key,
RequestDate = reader.GetDateTime(1),
PARNumber = reader.GetString(2),
DepartmentName = reader.GetString(10),
DepartmentID = reader.GetInt64(11),
StatusID = reader.GetInt64(3),
FullName = reader.GetString(7),
InboxLearUID = reader.GetString(12),
ProgramName = reader.GetString(14),
ItemList = new List<NomsPRItem>(),
TotalAmount = 0.0
});
}
dAmount = (double)reader.GetDecimal(21) * (double)reader.GetDecimal(22);
data[key].TotalAmount += dAmount;
****data[key].ItemList.Add(new NomsPRItem()****
{
RequestID = key,
PartDesc = reader.GetString(17),
PartNumber = reader.GetString(23),
SupplierID = reader.GetString(18),
FullName = reader.GetString(7),
AccountType = reader.GetString(19),
CurrName = reader.GetString(20),
PartQuantity = (double)reader.GetDecimal(21),
PiecePrice = (double)reader.GetDecimal(22),
Amount = dAmount
});
}
}
}
return data.Values.ToList();
}
我在这部分遇到错误
data[key].ItemList.Add(new NomsPRItem()
这是我的看法..
<table data-ng-show="models != null" class="table table-striped table-bordered table-hover"
id="PRTable" >
<tr class="titlerow">
<th>
<a href="#" data-ng-click="sorting='RequestDate'; reverse = !reverse">PR Date <span
data-ng-show="sorting == 'RequestDate'"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='RequestID '; reverse = !reverse">PR # <span data-ng-show="sorting == 'RequestID '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='PARNumber '; reverse = !reverse">PAR # <span
data-ng-show="sorting == 'PARNumber '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='ProgramName '; reverse = !reverse">Program <span
data-ng-show="sorting == 'ProgramName '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='FullName '; reverse = !reverse">Requestor <span
data-ng-show="sorting == 'FullName '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='DepartmentName '; reverse = !reverse">Department <span
data-ng-show="sorting == 'FullName '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='PONo'; reverse = !reverse">PO #
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='StatusID '; reverse = !reverse">PRStatus<span
data-ng-show="sorting == 'StatusID '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='Amount '; reverse = !reverse">Total Amount<span
data-ng-show="sorting == 'Amount '"></span>
</a>
</th>
<th>
<a href="#" data-ng-click="sorting='InboxLearUID '; reverse = !reverse">Last Action<span
data-ng-show="sorting == 'InboxLearUID '"></span>
</a>
</th>
</tr>
<tr data-ng-repeat="model in models | orderBy: sorting:reverse | filter : filterAllColumns | filter : filterOptions ">
<td>{{jsonDatetotext(model.RequestDate) | date:'MM/dd/yyyy'}}</td>
<td>
<a href="#" data-toggle="modal" data-target="#basicModalContent" data-ng-click="getSelectedPR(model)">{{model.RequestID}}
</a>
</td>
<td>{{model.PARNumber }}</td>
<td>{{model.ProgramName }}</td>
<td>{{model.FullName }}</td>
<td>{{model.DepartmentName | uppercase}}</td>
<td>{{model.PONo}}</td>
<td>{{StatusList[model.StatusID] | uppercase}}</td>
<td class="totalAmount"><span class="pull-right">{{model.TotalAmount | number:2}}</span>
</td>
<td>{{model.InboxLearUID | lowercase}}</td>
</tr>
</table>
</div>
<!-- /.Modal Na ni -->
<div class="modal fade" id="basicModalContent" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"
aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
</div>
<div class="modal-body" id="exportablePRItems">
<div class="table-responsive">
<table class="table table-striped table-bordered table-hover" id="dataTables-example">
<thead>
<tr>
<th>Item Code
</th>
<th>Item Description
</th>
<th>Supplier
</th>
<th>Account
</th>
<th>Currency
</th>
<th>Amount
</th>
<th>(USD) Amount
</th>
</tr>
</thead>
<tbody data-ng-repeat="selectedPR in selectedModal.ItemList">
<tr>
<td>{{selectedPR.PartNumber}}</td>
<td>{{selectedPR.PartDesc}}</td>
<td>{{selectedPR.SupplierID }}</td>
<td>{{selectedPR.AccountType}}</td>
<td>{{selectedPR.CurrName }}</td>
<td data-ng-model="amount" class="amount">{{selectedPR.Amount | number:2}}</td>
<td>{{selectedPR.AmountUSD}}</td>
</tr>
</tbody>
<tr>
<td><span class="pull-right"><i class="glyphicon glyphicon-plus-sign"></i></span></td>
<td colspan="3"><b>{{selectedModal.RequestID}}</b> </td>
<td colspan="1"><b>Total : </b></td>
<td colspan="2">{{selectedModal.ItemList | sumbykey : 'Amount' | number:2}}</td>
</tr>
</table>
</div>
<footer>
<br />
<button data-ng-click="exportDataItems()" class="btn btn-warning"><i class="glyphicon glyphicon-export"></i>Export Item </button>
</footer>
</div>
<div class="modal-footer">
<button id="btnModalCancel" type="button" class="btn btn-default" data-dismiss="modal">
Close</button>
</div>
</div>
</div>
</div>
</div>
</div>
任何人都可以帮助我调查这些代码，以便我可以继续我的下一步吗？
我认为问题在于将十进制类型转换为双精度类型。 如果 21 和 22 的值 return DbNull 那么你不能将该类型转换为 double。我建议：
- 确保索引 21 和 22 处的值 return 有效的十进制数。您可以在 sql 查询中使用 IsNull() 函数来执行此操作。
- 如果您的目的是获得双精度值，请尝试使用 reader.GetDouble(21) 和 reader.GetDouble(22) 而不是类型转换。
或者，您可以通过将该对象初始化代码提取为更小的部分来进行一些调试：
var npri = new NomsPRItem();
npri.RequestID = key;
npri.PartDesc = reader.GetString(17);
npri.PartNumber = reader.GetString(23);
npri.SupplierID = reader.GetString(18);
npri.FullName = reader.GetString(7);
npri.AccountType = reader.GetString(19);
npri.CurrName = reader.GetString(20);
npri.PartQuantity = (double)reader.GetDecimal(21);
npri.PiecePrice = (double)reader.GetDecimal(22);
npri.Amount = dAmount;
这将指出导致问题的确切列索引。
最好使用 IsDBNull .. 就像这个：
RequestID = key,
PartDesc = reader.IsDBNull(17) ? null : reader.GetString(17),
PartNumber = reader.IsDBNull(23) ? null : reader.GetString(23),
SupplierID = reader.IsDBNull(18) ? null : reader.GetString(18),
FullName = reader.IsDBNull(7) ? null : reader.GetString(7),
AccountType = reader.IsDBNull(19) ? null : reader.GetString(19),
CurrName = reader.IsDBNull(20) ? null : reader.GetString(20),
PartQuantity = (double)reader.GetDecimal(21),
PiecePrice = (double)reader.GetDecimal(22),
Amount = dAmount
希望能帮到你