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c# NPOI通过单元格里的公式,计算数值

业务场景

公司B是母公司A的子公司,每个月都需要将耗材销售情况统计向总公司报账。

其中计算的内容如下:

       1、该时间段客户a、b、c 。。。z的分别购买耗材金额,即该客户端销售额

  2、对于a、b、c 。。。z公司,每销售一个单位数量的耗材都有居间费(抽成)

c# NPOI通过单元格里的公式,计算数值_字段

 

 

 以上Excel中A-P列是从系统导出来的,其中Q(佣金总额)、P(业绩)列是公式拖拽生成的。

Q列的公式 H2 * M2(M列如果没有,默认为0)

R列的公式 L2 - Q2

以上公式,如果在任何一个Excel中,经过拖拽都很容易实现。

笔者以下使用C#中NPOI实现,将计算获得的数据存入DataTable

关键代码DataField.cs

public class DataField
{
private string _label;
private string _name;
private Type _type;
private int _columnWidth = 10 /* default 10 */;
private string _formula;
private bool _isRequireCreateColumn;

public DataField()
{ }

public DataField(string label, string name, Type type)
{
this._label = label;
this._name = name;
this._type = type;
}

public DataField(string label, string name, Type type, int columnWidth):this(label,name,type)
{
this.ColumnWidth = columnWidth;
}

public DataField(string label, string name, Type type, string formula)
: this(label, name, type)
{
this._formula = formula;
}


public DataField(string label, string name, Type type, int columnWidth, string formula)
: this(label, name, type,columnWidth)
{
this._formula = formula;
}


public DataField(string label, string name, Type type, string formula, bool isRequireCreateColumn)
: this(label, name, type,formula)
{
this._isRequireCreateColumn = isRequireCreateColumn;
}

public DataField(string label, string name, Type type, int columnWidth, string formula, bool isRequireCreateColumn)
: this(label, name, type,formula,isRequireCreateColumn)
{
this._columnWidth = columnWidth;
}


/// <summary>
/// 字段显示名称
/// </summary>
public string Label { get => _label; set => _label = value; }

/// <summary>
/// 字段属性名
/// </summary>
public string Name { get => _name; set => _name = value; }

/// <summary>
/// 字段数据类型
/// </summary>
public Type Type { get => _type; set => _type = value; }

/// <summary>
/// 字段宽度(n *256)
/// </summary>
public int ColumnWidth { get => _columnWidth; set => _columnWidth = value; }

/// <summary>
/// 公式(该字段必须是计算生成的类型)
/// </summary>
public string Formula { get => _formula; set => _formula = value; }

/// <summary>
/// 该字段通过创建插入表格中
/// </summary>
public bool IsRequireCreateColumn { get => _isRequireCreateColumn; set => _isRequireCreateColumn = value; }

}

关键业务代码

private static DataField[] fields = new DataField[] {
new DataField("序号","id",typeof(short)),
new DataField("选择","checked",typeof(string)),
//delivery time交货时间
//发货时间
new DataField("发货日期","shippingTime",typeof(DateTime)),
new DataField("客户简称","customerAbbreviation",typeof(string)),
new DataField("销售部门","department",typeof(string)),
new DataField("业 务 员","seller",typeof(string)),
new DataField("存货名称","productName",typeof(string),25),
new DataField("数量","quantity",typeof(int)),
new DataField("销售单位","unit",typeof(string)),
new DataField("无税单价","price",typeof(float)),
new DataField("无税金额","amount1",typeof(float)),
new DataField("价税合计","amount2",typeof(float)),
new DataField("居间费","commission",typeof(float)),
new DataField("发票总金额","",typeof(string)),
new DataField("制单人","",typeof(string)),
new DataField("审核人","",typeof(string)),
new DataField("佣金总额","totalCommission",typeof(float),"H{0} * M{0}",true),
new DataField("业绩","performance",typeof(float),"L{0} - Q{0}",true)
};


for (int lineNum = 0; lineNum < rowCount; ++lineNum)
{
DataRow NewRow = myTable.NewRow();
for (int index = 0; index < fields.Length; index++)
{
var field = fields[index];
string formula = field.Formula;
string label = field.Label;
string name = field.Name;
Type type = field.Type;
bool isRequireCreateColumn = field.IsRequireCreateColumn;

ICell cell;
object value = null;
//如果公式的值不为null/空字符等,则认为该列是需要计算生成的
if (isRequireCreateColumn || !string.IsNullOrWhiteSpace(formula))
{
//新建列并设置数据类型为公式
cell = defaultSheet.GetRow(lineNum + 1).CreateCell(index);
cell.SetCellType(CellType.Formula);
cell.SetCellFormula(string.Format(formula, lineNum + 2));
//评估表达式的值
workbook.GetCreationHelper().CreateFormulaEvaluator().EvaluateFormulaCell(cell);
value = cell.NumericCellValue;
}
}
}

笔者为每个列额外设置了数据类型(即DataField的Type属性),是为了方便在DataTable及后续里面进行数值计算甚至精确度裁剪。

经过以上设置,就可以计算出数值了

 

 最终效果

c# NPOI通过单元格里的公式,计算数值_字段_02

 

 

 

其他参考:

​​https://stackoverflow.com/questions/24088737/how-to-re-calculate-a-cells-formula​​

​​https://www.cr173.com/html/18143_all.html​​

​​https://stackoverflow.com/questions/25077009/npoi-setcellformula-custom-formula-in-vba​​

​​https://stackoverflow.com/questions/17475359/how-to-use-npoi-to-read-excel-spreadsheet-that-contains-empty-cells​​

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