从VSTO项目中的Excel工作簿中读取50万条记录

I am trying to build a simulation tool in Excel using VSTO and by creating a Visual Studio 2010 Office workbook project. One of the worksheets in this workbook will contain approximately half a million records. Ideally I would like to read all of the records use them in the simulation and then output back some statistics. So far I had OutOfMemory exceptions when I tried to get the whole range and then the cells out of it in one go. Does anyone have other ideas as to how I can read all of the data or suggestions in doing this?

我正在尝试使用VSTO在Excel中构建一个模拟工具，并创建一个Visual Studio 2010 Office工作簿项目。本工作簿中的一个工作表将包含大约五十万条记录。理想情况下，我想阅读所有在模拟中使用它们的记录，然后输出一些统计信息。到目前为止，当我试图获得整个范围然后一次性完成单元格时，我有OutOfMemory异常。有没有人对我如何阅读所有这些数据或建议有其他想法？

This is my code:

这是我的代码：

Excel.Range range = Globals.shData.Range["A2:AX500000"];

Excel.Range range = Globals.shData.Range [“A2：AX500000”];

Array values = (Array)range.Cells.Value;

数组值=（数组）range.Cells.Value;

2 个解决方案

#1

How about fetching in batches, and assembling a slightly less memory heavy model in memory?

如何批量获取，并在内存中组装一个稍微少一点的内存重型模型？

var firstRow = 2;
var lastRow = 500000;
var batchSize = 5000;
var batches = Enumerable
    .Range(0, (int)Math.Ceiling( (lastRow-firstRow) / (double)batchSize ))
    .Select(x => 
        string.Format(
            "A{0}:AX{1}",
            x * batchSize + firstRow,
            Math.Min((x+1) * batchSize + firstRow - 1, lastRow)))
    .Select(range => ((Array)Globals.shData.Range[range]).Cells.Value);

foreach(var batch in batches)
{
    foreach(var item in batch)
    {
        //reencode item into your own object collection.
    }
}

#2

This is not an Excel problem, rather a general C# issue. Instead of gathering all the rows in memory, yield the rows and calculate the stats iteratively.

这不是Excel问题，而是一般的C＃问题。而不是收集内存中的所有行，产生行并迭代计算统计数据。

For example

例如

class Program
{
    static void Main(string[] args)
    {
        var totalOfAllAges = 0D;
        var rows = new ExcelRows();

        //calculate various statistics
        foreach (var item in rows.GetRow())
        {
            totalOfAllAges += item.Age;
        }

        Console.WriteLine("The total of all ages is {0}", totalOfAllAges);
    }
}

internal class ExcelRows
{
    private double rowCount = 1500000D;
    private double rowIndex = 0D;

    public IEnumerable<ExcelRow> GetRow()
    {
        while (rowIndex < rowCount)
        {
            rowIndex++;
            yield return new ExcelRow() { Age = rowIndex };
        }
    }
}
/// <summary>
/// represents the next read gathered by VSTO
/// </summary>

internal class ExcelRow
{
    public double Age { get; set; }
}

#1