这可能不是最好的解决方案,但它确实对我有用。
我将数据转换为列表,并将其传递给名为“ToDataTable”的函数,以首先转换为数据表。
public DataTable ToDataTable<T>(List<T> items)
{
DataTable dataTable = new DataTable(typeof(T).Name);
PropertyInfo[] Props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach (PropertyInfo prop in Props)
{
dataTable.Columns.Add(prop.Name , prop.PropertyType);
}
foreach (T item in items)
{
var values = new object[Props.Length];
for (int i = 0; i < Props.Length; i++)
{
object val;
val = Props[i].GetValue(item, null);
values[i] = val;
}
dataTable.Rows.Add(values);
}
return dataTable;
}
然后使用 GetInversedDataTable() 函数将其转换为您想要的格式。
public static DataTable GetInversedDataTable(DataTable table, string columnX,
string columnY, string columnZ, string nullValue, bool sumValues)
{
DataTable returnTable = new DataTable();
if (columnX == "")
columnX = table.Columns[0].ColumnName;
returnTable.Columns.Add(columnY);
List<string> columnXValues = new List<string>();
foreach (DataRow dr in table.Rows)
{
string columnXTemp = dr[columnX].ToString();
if (!columnXValues.Contains(columnXTemp))
{
returnTable.Columns.Add(columnXTemp);
}
}
//Verify if Y and Z Axis columns re provided
if (columnY != "" && columnZ != "")
{
List<string> columnYValues = new List<string>();
foreach (DataRow dr in table.Rows)
{
if (!columnYValues.Contains(dr[columnY].ToString()))
columnYValues.Add(dr[columnY].ToString());
}
//Loop all Column Y Distinct Value
foreach (string columnYValue in columnYValues)
{
DataRow drReturn = returnTable.NewRow();
drReturn[0] = columnYValue;
DataRow[] rows = table.Select(columnY + "='" + columnYValue + "'");
foreach (DataRow dr in rows)
{
string rowColumnTitle = dr[columnX].ToString();
foreach (DataColumn dc in returnTable.Columns)
{
if (dc.ColumnName == rowColumnTitle)
{
if (sumValues)
{
try
{
drReturn[rowColumnTitle] =
Convert.ToDecimal(drReturn[rowColumnTitle]) +
Convert.ToDecimal(dr[columnZ]);
}
catch
{
drReturn[rowColumnTitle] = dr[columnZ];
}
}
else
{
drReturn[rowColumnTitle] = dr[columnZ];
}
}
}
}
returnTable.Rows.Add(drReturn);
}
}
else
{
throw new Exception("The columns to perform inversion are not provided");
}
if (nullValue != "")
{
foreach (DataRow dr in returnTable.Rows)
{
foreach (DataColumn dc in returnTable.Columns)
{
if (dr[dc.ColumnName].ToString() == "")
dr[dc.ColumnName] = nullValue;
}
}
}
return returnTable;
}
像这样使用它:
DataTable dtReturn = GetInversedDataTable(dt, "client", "emp_id",
"allocation", "0", true);
提供了三列并返回一个新的 DataTable。
下面的示例将使用源表和下面的参数来构建数据透视表。
就你而言:
X 轴列:“客户端”
Y 轴列:“emp_id”
Z轴栏:“分配”
空值:“0”;
值总和:true
请注意,这是我用于解决我的问题的代码,并且我的代码是 C# 语言