我有dataset我正在转动然后绑定到网格视图。当旋转表中存在所有itemtemplates值时，它工作正常，但如果旋转表中没有任何列，则在绑定gridview时，我收到错误。请帮助我如何在网格视图中处理它，如果任何列不存在但我将它绑定到网格视图itemtemplate。下面是我的网格视图代码。
<asp:GridView ID="gvCoreUtilization" runat="server" BackColor="White" BorderColor="#cEcFcE"
BorderStyle="Solid" BorderWidth="1px" CellPadding="4" ForeColor="Black" OnRowCreated="grdPivot3_RowCreated"
AutoGenerateColumns="false" OnRowDataBound="grdCoreUtilization_RowDataBound">
<RowStyle BackColor="#F7F7DE" />
<FooterStyle BackColor="#CCCC99" />
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" HorizontalAlign="Left" />
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblRoleID" Text='<%#Eval("RoleId") %>' runat="server" Visible="false"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
SupervisorName
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblSupervisorName" Text='<%#Eval("SupervisorName") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
UserECode
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblUserECode" Text='<%#Eval("UserECode") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
UserName
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblUserName" Text='<%#Eval("UserName") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Designation
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblDesignation" Text='<%#Eval("Designation") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
L & D Training%
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblLDTraining" Text='<%#Eval("L & D Training%") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Non Production%
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblNonProduction" Text='<%#Eval("Non Production%") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Process Support%
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblProcessSupport" Text='<%#Eval("Process Support%") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Process Training%
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblProcessTraining" Text='<%#Eval("Process Training%") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Production%
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblProduction" Text='<%#Eval("Production%") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
System Downtime%
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblSystemDowntime" Text='<%#Eval("System Downtime%") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Grand Total%
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblGrandTotal" Text='<%#Eval("Grand Total%") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
实际上"L & D Training%"，"Non Production%"，"Process Support%“，"Process Training%"，"Production%"，"System Downtime%"，"Grand Total%"是透视列我绑定到itemtemplate。对于一些用户这些列中的一些不存在，并且在绑定网格时我收到错误。
以下是我正在进行支点的Pivot类的代码： -
private DataTable _SourceTable = new DataTable();
private IEnumerable<DataRow> _Source = new List<DataRow>();
public Pivot(DataTable SourceTable)
{
_SourceTable = SourceTable;
_Source = SourceTable.Rows.Cast<DataRow>();
}
public DataTable PivotData(string DataField, AggregateFunction Aggregate, string[] RowFields, string[] ColumnFields)
{
DataTable dt = new DataTable();
string Separator = ".";
var RowList = _SourceTable.DefaultView.ToTable(true, RowFields).AsEnumerable().ToList();
for (int index = RowFields.Count() - 1; index >= 0; index--)
RowList = RowList.OrderBy(x => x.Field<object>(RowFields[index])).ToList();
// Gets the list of columns .(dot) separated.
var ColList = (from x in _SourceTable.AsEnumerable()
select new
{
Name = ColumnFields.Select(n => x.Field<object>(n))
.Aggregate((a, b) => a += Separator + b.ToString())
})
.Distinct()
.OrderBy(m => m.Name);
//dt.Columns.Add(RowFields);
foreach (string s in RowFields)
dt.Columns.Add(s);
foreach (var col in ColList)
dt.Columns.Add(col.Name.ToString()); // Cretes the result columns.//
foreach (var RowName in RowList)
{
DataRow row = dt.NewRow();
string strFilter = string.Empty;
foreach (string Field in RowFields)
{
row[Field] = RowName[Field];
strFilter += " and " + Field + " = '" + RowName[Field].ToString() + "'";
}
strFilter = strFilter.Substring(5);
foreach (var col in ColList)
{
string filter = strFilter;
string[] strColValues = col.Name.ToString().Split(Separator.ToCharArray(), StringSplitOptions.None);
for (int i = 0; i < ColumnFields.Length; i++)
filter += " and " + ColumnFields[i] + " = '" + strColValues[i] + "'";
row[col.Name.ToString()] = GetData(filter, DataField, Aggregate);
}
dt.Rows.Add(row);
}
return dt;
}
public DataTable PivotAllocationData(string DataField, AggregateFunction Aggregate, string[] RowFields, string[] ColumnFields)
{
DataTable dt = new DataTable();
string Separator = ".";
var RowList = _SourceTable.DefaultView.ToTable(true, RowFields).AsEnumerable().ToList();
for (int index = RowFields.Count() - 1; index >= 0; index--)
RowList = RowList.OrderBy(x => x.Field<object>(RowFields[index])).ToList();
// Gets the list of columns .(dot) separated.
var ColList = (from x in _SourceTable.AsEnumerable()
select new
{
Name = ColumnFields.Select(n => x.Field<object>(n))
.Aggregate((a, b) => a += Separator + b.ToString())
})
.Distinct()
.OrderBy(m => m.Name);
//dt.Columns.Add(RowFields);
foreach (string s in RowFields)
dt.Columns.Add(s);
foreach (var col in ColList)
dt.Columns.Add(col.Name.ToString()); // Cretes the result columns.//
foreach (var RowName in RowList)
{
DataRow row = dt.NewRow();
string strFilter = string.Empty;
foreach (string Field in RowFields)
{
row[Field] = RowName[Field];
strFilter += " and " + Field + " = '" + RowName[Field].ToString() + "'";
}
strFilter = strFilter.Substring(5);
foreach (var col in ColList)
{
string filter = strFilter;
string[] strColValues = col.Name.ToString().Split(Separator.ToCharArray(), StringSplitOptions.None);
for (int i = 0; i < ColumnFields.Length; i++)
filter += " and " + ColumnFields[i] + " = '" + strColValues[i] + "'";
row[col.Name.ToString()] = GetAllocationData(filter, DataField, Aggregate);
}
dt.Rows.Add(row);
}
return dt;
}
/// <summary>
/// Retrives the data for matching RowField value and ColumnFields values with Aggregate function applied on them.
/// </summary>
/// <param name="Filter">DataTable Filter condition as a string</param>
/// <param name="DataField">The column name which needs to spread out in Data Part of the Pivoted table</param>
/// <param name="Aggregate">Enumeration to determine which function to apply to aggregate the data</param>
/// <returns></returns>
private object GetData(string Filter, string DataField, AggregateFunction Aggregate)
{
try
{
DataRow[] FilteredRows = _SourceTable.Select(Filter);
object[] objList = FilteredRows.Select(x => x.Field<object>(DataField)).ToArray();
switch (Aggregate)
{
case AggregateFunction.Average:
return GetAverage(objList);
case AggregateFunction.Count:
return objList.Count();
case AggregateFunction.Exists:
return (objList.Count() == 0) ? "False" : "True";
case AggregateFunction.First:
return GetFirst(objList);
case AggregateFunction.Last:
return GetLast(objList);
case AggregateFunction.Max:
return GetMax(objList);
case AggregateFunction.Min:
return GetMin(objList);
case AggregateFunction.Sum:
return GetSum(objList);
default:
return null;
}
}
catch (Exception ex)
{
return "#Error";
}
}
/// <summary>
/// Retrives the data for matching RowField value and ColumnFields values with Aggregate function applied on them.
/// </summary>
/// <param name="Filter">DataTable Filter condition as a string</param>
/// <param name="DataField">The column name which needs to spread out in Data Part of the Pivoted table</param>
/// <param name="Aggregate">Enumeration to determine which function to apply to aggregate the data</param>
/// <returns></returns>
private object GetAllocationData(string Filter, string DataField, AggregateFunction Aggregate)
{
try
{
DataRow[] FilteredRows = _SourceTable.Select(Filter);
object[] objList = FilteredRows.Select(x => x.Field<object>(DataField)).ToArray();
switch (Aggregate)
{
case AggregateFunction.Average:
return GetAverage(objList);
case AggregateFunction.Count:
return objList.Count();
case AggregateFunction.Exists:
return (objList.Count() == 0) ? "False" : "True";
case AggregateFunction.First:
return GetFirst(objList);
case AggregateFunction.Last:
return GetLast(objList);
case AggregateFunction.Max:
return GetMax(objList);
case AggregateFunction.Min:
return GetMin(objList);
case AggregateFunction.Sum:
return GetAllocationSum(objList);
default:
return null;
}
}
catch (Exception ex)
{
return "#Error";
}
}
private object GetAverage(object[] objList)
{
return objList.Count() == 0 ? null : (object)(Convert.ToDecimal(GetSum(objList)) / objList.Count());
}
private object GetSum(object[] objList)
{
return objList.Count() == 0 ? null : (object)(objList.Aggregate(new decimal(), (x, y) => x += Convert.ToDecimal(y)) + "%");
}
private object GetAllocationSum(object[] objList)
{
return objList.Count() == 0 ? null : (object)(objList.Aggregate(new decimal(), (x, y) => x += Convert.ToDecimal(y)));
}
private object GetFirst(object[] objList)
{
return (objList.Count() == 0) ? null : objList.First();
}
private object GetLast(object[] objList)
{
return (objList.Count() == 0) ? null : objList.Last();
}
private object GetMax(object[] objList)
{
return (objList.Count() == 0) ? null : objList.Max();
}
private object GetMin(object[] objList)
{
return (objList.Count() == 0) ? null : objList.Min();
}
public enum AggregateFunction
{ 计数= 1， Sum = 2， 第一个= 3， 最后= 4， 平均值= 5， 最大= 6， 最小= 7， 存在= 8 }
答案 0 :(得分：0)
由于您未提供正在使用的实际数据库。您可以应用以下技巧。 问题是你需要创建一个包装类来提取你拥有的数据，然后在网格正在使用的定义好的模式中格式化数据。
EG。假设您在表中有3列，但另一列可以包含＆lt;＆gt; 3，依此类推。由于gridview外观相同，因此请创建一个包含gridview所有行的数据表。 创建一个提取所有数据的函数，并使用可用数据填充此数据表，并且将使用空值或空值填充不可用的数据。
这样可以缓解抛出异常的问题。将变量长度表转换为固定长度数据表的函数的实际实现将取决于用于创建这些可变长度数据表的实际逻辑以及它们如何相互映射。