而创建字符串要写入我的CSV文件在c#中，我必须这样格式化它:

"=\"" + myVariable + "\""

我发现在双引号前加一个'='就能达到你想要的效果。它强制数据为文本。

如。=“2008-10-03”=“文本”

编辑(根据其他帖子):由于Jeffiekins指出的Excel 2007漏洞，应该使用Andrew提出的解决方案:"=""2008-10-03""" "

I know this is an old question, but the problem is not going away soon. CSV files are easy to generate from most programming languages, rather small, human-readable in a crunch with a plain text editor, and ubiquitous. The problem is not only with dates in text fields, but anything numeric also gets converted from text to numbers. A couple of examples where this is problematic: ZIP/postal codes telephone numbers government ID numbers which sometimes can start with one or more zeroes (0), which get thrown away when converted to numeric. Or the value contains characters that can be confused with mathematical operators (as in dates: /, -). Two cases that I can think of that the "prepending =" solution, as mentioned previously, might not be ideal is where the file might be imported into a program other than MS Excel (MS Word's Mail Merge function comes to mind), where human-readability might be important. My hack to work around this If one pre/appends a non-numeric and/or non-date character in the value, the value will be recognized as text and not converted. A non-printing character would be good as it will not alter the displayed value. However, the plain old space character (\s, ASCII 32) doesn't work for this as it gets chopped off by Excel and then the value still gets converted. But there are various other printing and non-printing space characters that will work well. The easiest however is to append (add after) the simple tab character (\t, ASCII 9). Benefits of this approach: Available from keyboard or with an easy-to-remember ASCII code (9), It doesn't bother the importation, Normally does not bother Mail Merge results (depending on the template layout - but normally it just adds a wide space at the end of a line). (If this is however a problem, look at other characters e.g. the zero-width space (ZWSP, Unicode U+200B) is not a big hindrance when viewing the CSV in Notepad (etc), and could be removed by find/replace in Excel (or Notepad etc). You don't need to import the CSV, but can simply double-click to open the CSV in Excel. If there's a reason you don't want to use the tab, look in an Unicode table for something else suitable. Another option might be to generate XML files, for which a certain format also is accepted for import by newer MS Excel versions, and which allows a lot more options similar to .XLS format, but I don't have experience with this. So there are various options. Depending on your requirements/application, one might be better than another. Addition It needs to be said that newer versions (2013+) of MS Excel don't open the CSV in spreadsheet format any more - one more speedbump in one's workflow making Excel less useful... At least, instructions exist for getting around it. See e.g. this Stackoverflow: How to correctly display .csv files within Excel 2013? .

我知道这是个老话题了。对于像我这样的人来说，通过PowerShell COM对象使用Office 2013仍然有这个问题，可以使用opentext方法。问题是这个方法有很多参数，有时是相互排斥的。要解决这个问题，您可以使用本文介绍的invoke-namedparameter方法。 一个例子是

$ex = New-Object -com "Excel.Application"
$ex.visible = $true
$csv = "path\to\your\csv.csv"
Invoke-NamedParameter ($ex.workbooks) "opentext" @{"filename"=$csv; "Semicolon"= $true}

不幸的是，我刚刚发现当单元格包含换行符时，该方法会以某种方式破坏CSV解析。这是CSV支持的，但微软的实现似乎有bug。 此外，它不知何故没有检测到德语特有的字符。给它正确的文化并没有改变这种行为。所有文件(CSV和脚本)都使用utf8编码保存。 首先，我编写了以下代码，逐个单元插入CSV。

$ex = New-Object -com "Excel.Application"
$ex.visible = $true;
$csv = "path\to\your\csv.csv";
$ex.workbooks.add();
$ex.activeWorkbook.activeSheet.Cells.NumberFormat = "@";
$data = import-csv $csv -encoding utf8 -delimiter ";"; 
$row = 1; 
$data | %{ $obj = $_; $col = 1; $_.psobject.properties.Name |%{if($row -eq1){$ex.ActiveWorkbook.activeSheet.Cells.item($row,$col).Value2= $_ };$ex.ActiveWorkbook.activeSheet.Cells.item($row+1,$col).Value2 =$obj.$_; $col++ }; $row++;}

但这太慢了，所以我找了个替代品。显然，Excel允许您使用矩阵设置单元格范围的值。所以我在这篇博客中使用算法将CSV转换为一个多数组。

function csvToExcel($csv,$delimiter){
     $a = New-Object -com "Excel.Application"
     $a.visible = $true
     
    $a.workbooks.add()
     $a.activeWorkbook.activeSheet.Cells.NumberFormat = "@"
     $data = import-csv -delimiter $delimiter $csv; 
     $array = ($data |ConvertTo-MultiArray).Value
     $starta = [int][char]'a' - 1
     if ($array.GetLength(1) -gt 26) {
         $col = [char]([int][math]::Floor($array.GetLength(1)/26) + $starta) + [char](($array.GetLength(1)%26) + $Starta)
     } else {
         $col = [char]($array.GetLength(1) + $starta)
     }
     $range = $a.activeWorkbook.activeSheet.Range("a1:"+$col+""+$array.GetLength(0))
     $range.value2 = $array;
     $range.Columns.AutoFit();
     $range.Rows.AutoFit();
     $range.Cells.HorizontalAlignment = -4131
     $range.Cells.VerticalAlignment = -4160
}

 function ConvertTo-MultiArray {
     param(
         [Parameter(Mandatory=$true, Position=1, ValueFromPipeline=$true)]
         [PSObject[]]$InputObject
     )
     BEGIN {
         $objects = @()
         [ref]$array = [ref]$null
     }
     Process {
         $objects += $InputObject
     }
     END {
         $properties = $objects[0].psobject.properties |%{$_.name}
         $array.Value = New-Object 'object[,]' ($objects.Count+1),$properties.count
         # i = row and j = column
         $j = 0
         $properties |%{
             $array.Value[0,$j] = $_.tostring()
             $j++
         }
         $i = 1
         $objects |% {
             $item = $_
             $j = 0
             $properties | % {
                 if ($item.($_) -eq $null) {
                     $array.value[$i,$j] = ""
                 }
                 else {
                     $array.value[$i,$j] = $item.($_).tostring()
                 }
                 $j++
             }
             $i++
         }
         $array
     } 
} 
csvToExcel "storage_stats.csv" ";"

你可以按原样使用上面的代码;它应该将任何CSV转换为Excel。只需将路径更改为CSV和底部的分隔符。

SELECT CONCAT('\'',NOW(),'\''), firstname, lastname 
FROM your_table
INTO OUTFILE 'export.csv' 
FIELDS TERMINATED BY ',' 
ENCLOSED BY '\"' 
LINES TERMINATED BY '\n'

我在Excel 2003和2007中找到了一个简单的方法。打开一个空白的xls工作簿。然后进入数据菜单，导入外部数据。选择您的csv文件。通过向导，然后在“列数据格式”中选择任何需要强制“文本”的列。这将以文本格式导入整个列，防止Excel试图将任何特定的单元格作为日期处理。