1. IronXL
  2. 疑難排解
  3. Excel 限制：字串清單的資料驗證

Excel 針對字串資料驗證的限制

Curtis Chau
Curtis Chau
更新:
This article was translated from English: Does it need improvement?
Translated
View the article in English

Microsoft Excel 對字串清單長度有已知限制，規定清單總長度（包含逗號等分隔符號）不得超過 255 個字元。

此問題發生於您在"來源欄位"中手動輸入字串清單，而非從 Excel 試算表中的現有範圍選取資料，如下所示。

Excel 限制問題

Excel 限制問題

解決 Excel 的限制

針對此限制的標準解決方案，是在工作表的某個欄位或列中建立值清單，而非在"來源欄位"中輸入字串清單。 如下所示。

Example Solution

範例：Excel 限制解決方案

之後，請在資料驗證中使用公式參照（例如 C1:C100），並指向該範圍。

新來源
新資料

此方法可繞過限制，讓您建立下拉式清單時，無需受 255 個字元的限制。

IronXL 上的問題

IronXL 使用 AddStringListRule 方法來套用一組字串以進行資料驗證。 然而，由於上述 Excel 的字元限制問題，該儲存方法仍可正常運作。 然而，必須注意的是，若清單長度超過 255 個字元，可能會導致嚴重問題：開啟檔案時 Excel 會當機。 以下是一個說明此問題的範例。

using IronXL;
using IronXl.DataValidations;

// Set your license key here if you have one
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY";
var workBook = WorkBook.Create(ExcelFileFormat.XLSX);

var sheet = workBook.CreateWorkSheet("Validation Rule Example using");
// Apply rules from row 2 down to row 500
var validationRangeStart = "2";
var validationRangeFinish = "500";

// --- 1. Define All Column Headers ---
sheet["A1"].Value = "String List Test";
sheet["B1"].Value = "Formula List Test";
sheet["A1:B1"].Style.Font.Bold = true;

// 256
string[] arrayString = new string[]
{
    "SKU-A01-R", "SKU-A02-R", "SKU-A03-R", "SKU-A04-R", "SKU-A05-R",
    "SKU-B01-G", "SKU-B02-G", "SKU-B03-G", "SKU-B04-G", "SKU-B05-G",
    "SKU-C01-B", "SKU-C02-B", "SKU-C03-B", "SKU-C04-B", "SKU-C05-B",
    "SKU-D01-Y", "SKU-D02-Y", "SKU-D03-Y", "SKU-D04-Y", "SKU-D05-Y",
    "END-001", "END-002", "END-003", "END-004", "END-005", "END-010", "END-001"
}; // total char with seperator 257 (230 char + 26 sperator [,] )

// no problem when write to a file
var skuValidation = sheet.DataValidations.AddStringListRule(sheet[$"A{validationRangeStart}:A{validationRangeFinish}"].RangeAddress, arrayString);

// set error box
skuValidation.ShowErrorBox = true;
skuValidation.ErrorBoxTitle = "Invalid SKU";
skuValidation.ErrorBoxText = "Please select a SKU from the list.";
skuValidation.ErrorAlert = ErrorAlert.Stop;

//attempt to save the file
var fileName = "CategoryProductCatalog.xlsx";
workBook.SaveAs(fileName);
using IronXL;
using IronXl.DataValidations;

// Set your license key here if you have one
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY";
var workBook = WorkBook.Create(ExcelFileFormat.XLSX);

var sheet = workBook.CreateWorkSheet("Validation Rule Example using");
// Apply rules from row 2 down to row 500
var validationRangeStart = "2";
var validationRangeFinish = "500";

// --- 1. Define All Column Headers ---
sheet["A1"].Value = "String List Test";
sheet["B1"].Value = "Formula List Test";
sheet["A1:B1"].Style.Font.Bold = true;

// 256
string[] arrayString = new string[]
{
    "SKU-A01-R", "SKU-A02-R", "SKU-A03-R", "SKU-A04-R", "SKU-A05-R",
    "SKU-B01-G", "SKU-B02-G", "SKU-B03-G", "SKU-B04-G", "SKU-B05-G",
    "SKU-C01-B", "SKU-C02-B", "SKU-C03-B", "SKU-C04-B", "SKU-C05-B",
    "SKU-D01-Y", "SKU-D02-Y", "SKU-D03-Y", "SKU-D04-Y", "SKU-D05-Y",
    "END-001", "END-002", "END-003", "END-004", "END-005", "END-010", "END-001"
}; // total char with seperator 257 (230 char + 26 sperator [,] )

// no problem when write to a file
var skuValidation = sheet.DataValidations.AddStringListRule(sheet[$"A{validationRangeStart}:A{validationRangeFinish}"].RangeAddress, arrayString);

// set error box
skuValidation.ShowErrorBox = true;
skuValidation.ErrorBoxTitle = "Invalid SKU";
skuValidation.ErrorBoxText = "Please select a SKU from the list.";
skuValidation.ErrorAlert = ErrorAlert.Stop;

//attempt to save the file
var fileName = "CategoryProductCatalog.xlsx";
workBook.SaveAs(fileName);
Imports IronXL
Imports IronXl.DataValidations

' Set your license key here if you have one
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY"
Dim workBook = WorkBook.Create(ExcelFileFormat.XLSX)

Dim sheet = workBook.CreateWorkSheet("Validation Rule Example using")
' Apply rules from row 2 down to row 500
Dim validationRangeStart = "2"
Dim validationRangeFinish = "500"

' --- 1. Define All Column Headers ---
sheet("A1").Value = "String List Test"
sheet("B1").Value = "Formula List Test"
sheet("A1:B1").Style.Font.Bold = True

' 256
Dim arrayString As String() = New String() {
    "SKU-A01-R", "SKU-A02-R", "SKU-A03-R", "SKU-A04-R", "SKU-A05-R",
    "SKU-B01-G", "SKU-B02-G", "SKU-B03-G", "SKU-B04-G", "SKU-B05-G",
    "SKU-C01-B", "SKU-C02-B", "SKU-C03-B", "SKU-C04-B", "SKU-C05-B",
    "SKU-D01-Y", "SKU-D02-Y", "SKU-D03-Y", "SKU-D04-Y", "SKU-D05-Y",
    "END-001", "END-002", "END-003", "END-004", "END-005", "END-010", "END-001"
} ' total char with separator 257 (230 char + 26 separator [,] )

' no problem when write to a file
Dim skuValidation = sheet.DataValidations.AddStringListRule(sheet($"A{validationRangeStart}:A{validationRangeFinish}").RangeAddress, arrayString)

' set error box
skuValidation.ShowErrorBox = True
skuValidation.ErrorBoxTitle = "Invalid SKU"
skuValidation.ErrorBoxText = "Please select a SKU from the list."
skuValidation.ErrorAlert = ErrorAlert.Stop

'attempt to save the file
Dim fileName = "CategoryProductCatalog.xlsx"
workBook.SaveAs(fileName)
$vbLabelText   $csharpLabel

在程式碼中，我們嘗試將名為 arrayString 的字串清單作為來源，用以建立下拉式清單。接著，我們嘗試將其儲存為 CategoryProductCatalog.xlsx。 然而，由於這些限制，當使用 Microsoft Excel 開啟該檔案時，會顯示一則訊息，指出檔案已損壞且無法開啟。

替代文字

IronXL 的解決方案

為妥善解決此 Excel 限制，IronXL 提供了 AddFormulaListRule 方法，該方法可透過 DataValidations 屬性取得。 此方法與處理 Excel 的解決方案類似。

我們首先將值清單寫入工作表上的某個儲存格範圍中。 接著使用 AddFormulaListRule 來引用該範圍作為下拉式清單的來源。這實際上是透過與 Excel 解決方案相同的方法來繞過限制，但在此情況下，是透過程式化方式實現的。

正確使用 AddFormulaListRule 既能繞過 Excel 的限制，又能確保即使在 Excel 中開啟包含長串數值的檔案時，檔案仍能保持可讀性與穩定性。

程式碼範例

以下是可解決此問題的補充範例程式碼。 使用同一工作簿，我們首先建立一個工作表，然後定義所有欄位標題。 我們將輸入前一個範例中的字串清單，以及用以說明功能的新資料。 接著，我們會使用上述的驗證範圍來呼叫 AddFormulaListRule。 最後，我們將其儲存為 validationRuleExample.xlsx。 為確保工作簿未受損且能正常使用，我們在 Excel 中開啟它。 此步驟至關重要，因為它展示了我們程式碼的成功實作。

using IronXL;
using IronXl.DataValidations;
using System;

// Set your license key here if you have one
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY";
var workBook = WorkBook.Create(ExcelFileFormat.XLSX);

var sheet = workBook.CreateWorkSheet("Validation Rule Example using");
// Apply rules from row 2 down to row 500
var validationRangeStart = "2";
var validationRangeFinish = "500";

// --- 1. Define All Column Headers ---
sheet["A1"].Value = "String List Test";
sheet["B1"].Value = "Formula List Test";
sheet["A1:B1"].Style.Font.Bold = true;

string[] arrayString2 = new string[] 
{ 
    "SKU-A01-R", "SKU-A02-R", "SKU-A03-R", "SKU-A04-R", "SKU-A05-R",
    "SKU-B01-G", "SKU-B02-G", "SKU-B03-G", "SKU-B04-G", "SKU-B05-G",
    "SKU-C01-B", "SKU-C02-B", "SKU-C03-B", "SKU-C04-B", "SKU-C05-B",
    "SKU-D01-Y", "SKU-D02-Y", "SKU-D03-Y", "SKU-D04-Y", "SKU-D05-Y",
    "END-001", "END-002", "END-003", "END-004", "END-005", "END-010", "END-001",
    "IRON01","IRON02","IRON03","IRON04","IRON05","IRON06","IRON07","IRON08","IRON09","IRON10",
    "IRON11","IRON12","IRON13","IRON14","IRON15","IRON16","IRON17","IRON18","IRON19","IRON20",
    "IRON21","IRON22","IRON23","IRON24","IRON25","IRON26","IRON27","IRON28","IRON29","IRON30",
    "IRON31","IRON32","IRON33","IRON34","IRON35","IRON36","IRON37","IRON38","IRON39","IRON40",
    "IRON41","IRON42","IRON43","IRON44","IRON45","IRON46","IRON47","IRON48","IRON49","IRON50",
    "IRON51","IRON52","IRON53","IRON54","IRON55","IRON56","IRON57","IRON58","IRON59","IRON60",
    "IRON61","IRON62","IRON63","IRON64","IRON65","IRON66","IRON67","IRON68","IRON69","IRON70",
    "IRON71","IRON72","IRON73","IRON74","IRON75","IRON76","IRON77","IRON78","IRON79","IRON80",
    "IRON81","IRON82","IRON83","IRON84","IRON85","IRON86","IRON87","IRON88","IRON89","IRON90",
    "IRON91","IRON92","IRON93","IRON94","IRON95","IRON96","IRON97","IRON98","IRON99","IRON100"
}; // total char with seperator 257 (230 char + 26 sperator [,] )

//Write the contents of your array to column A of the data sheet.
for (int i = 0; i < arrayString2.Length; i++)
{
    // Note: IronXL row and cell indices are 1-based.
    sheet[$"A{i + 1}"].Value = arrayString2[i];
}

// Create the formula string that points to our data range.
// This will look like: 'ValidationData'!$A$1:$A$100

string formula = $"'{sheet.Name}'!$A$1:$A${arrayString2.Length}";
Console.WriteLine($"Generated formula for validation: {formula}");

var sku2Validation = sheet.DataValidations.AddFormulaListRule(sheet[$"B{validationRangeStart}:B{validationRangeFinish}"], formula);

sku2Validation.ShowErrorBox = true;
sku2Validation.ErrorBoxTitle = "Invalid SKU2";
sku2Validation.ErrorBoxText = "Please select a SKU from the list.";
sku2Validation.ErrorAlert = ErrorAlert.Stop;

// --- Final Touches ---
sheet.AutoSizeColumn(0, true);
sheet.AutoSizeColumn(1, true);

var fileName = "validationRuleExample.xlsx";
workBook.SaveAs(fileName);

Console.WriteLine($"Successfully created '{fileName}' with 2 validation rules example.");
using IronXL;
using IronXl.DataValidations;
using System;

// Set your license key here if you have one
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY";
var workBook = WorkBook.Create(ExcelFileFormat.XLSX);

var sheet = workBook.CreateWorkSheet("Validation Rule Example using");
// Apply rules from row 2 down to row 500
var validationRangeStart = "2";
var validationRangeFinish = "500";

// --- 1. Define All Column Headers ---
sheet["A1"].Value = "String List Test";
sheet["B1"].Value = "Formula List Test";
sheet["A1:B1"].Style.Font.Bold = true;

string[] arrayString2 = new string[] 
{ 
    "SKU-A01-R", "SKU-A02-R", "SKU-A03-R", "SKU-A04-R", "SKU-A05-R",
    "SKU-B01-G", "SKU-B02-G", "SKU-B03-G", "SKU-B04-G", "SKU-B05-G",
    "SKU-C01-B", "SKU-C02-B", "SKU-C03-B", "SKU-C04-B", "SKU-C05-B",
    "SKU-D01-Y", "SKU-D02-Y", "SKU-D03-Y", "SKU-D04-Y", "SKU-D05-Y",
    "END-001", "END-002", "END-003", "END-004", "END-005", "END-010", "END-001",
    "IRON01","IRON02","IRON03","IRON04","IRON05","IRON06","IRON07","IRON08","IRON09","IRON10",
    "IRON11","IRON12","IRON13","IRON14","IRON15","IRON16","IRON17","IRON18","IRON19","IRON20",
    "IRON21","IRON22","IRON23","IRON24","IRON25","IRON26","IRON27","IRON28","IRON29","IRON30",
    "IRON31","IRON32","IRON33","IRON34","IRON35","IRON36","IRON37","IRON38","IRON39","IRON40",
    "IRON41","IRON42","IRON43","IRON44","IRON45","IRON46","IRON47","IRON48","IRON49","IRON50",
    "IRON51","IRON52","IRON53","IRON54","IRON55","IRON56","IRON57","IRON58","IRON59","IRON60",
    "IRON61","IRON62","IRON63","IRON64","IRON65","IRON66","IRON67","IRON68","IRON69","IRON70",
    "IRON71","IRON72","IRON73","IRON74","IRON75","IRON76","IRON77","IRON78","IRON79","IRON80",
    "IRON81","IRON82","IRON83","IRON84","IRON85","IRON86","IRON87","IRON88","IRON89","IRON90",
    "IRON91","IRON92","IRON93","IRON94","IRON95","IRON96","IRON97","IRON98","IRON99","IRON100"
}; // total char with seperator 257 (230 char + 26 sperator [,] )

//Write the contents of your array to column A of the data sheet.
for (int i = 0; i < arrayString2.Length; i++)
{
    // Note: IronXL row and cell indices are 1-based.
    sheet[$"A{i + 1}"].Value = arrayString2[i];
}

// Create the formula string that points to our data range.
// This will look like: 'ValidationData'!$A$1:$A$100

string formula = $"'{sheet.Name}'!$A$1:$A${arrayString2.Length}";
Console.WriteLine($"Generated formula for validation: {formula}");

var sku2Validation = sheet.DataValidations.AddFormulaListRule(sheet[$"B{validationRangeStart}:B{validationRangeFinish}"], formula);

sku2Validation.ShowErrorBox = true;
sku2Validation.ErrorBoxTitle = "Invalid SKU2";
sku2Validation.ErrorBoxText = "Please select a SKU from the list.";
sku2Validation.ErrorAlert = ErrorAlert.Stop;

// --- Final Touches ---
sheet.AutoSizeColumn(0, true);
sheet.AutoSizeColumn(1, true);

var fileName = "validationRuleExample.xlsx";
workBook.SaveAs(fileName);

Console.WriteLine($"Successfully created '{fileName}' with 2 validation rules example.");
Imports IronXL
Imports IronXl.DataValidations
Imports System

' Set your license key here if you have one
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY"
Dim workBook = WorkBook.Create(ExcelFileFormat.XLSX)

Dim sheet = workBook.CreateWorkSheet("Validation Rule Example using")
' Apply rules from row 2 down to row 500
Dim validationRangeStart = "2"
Dim validationRangeFinish = "500"

' --- 1. Define All Column Headers ---
sheet("A1").Value = "String List Test"
sheet("B1").Value = "Formula List Test"
sheet("A1:B1").Style.Font.Bold = True

Dim arrayString2 As String() = New String() {
    "SKU-A01-R", "SKU-A02-R", "SKU-A03-R", "SKU-A04-R", "SKU-A05-R",
    "SKU-B01-G", "SKU-B02-G", "SKU-B03-G", "SKU-B04-G", "SKU-B05-G",
    "SKU-C01-B", "SKU-C02-B", "SKU-C03-B", "SKU-C04-B", "SKU-C05-B",
    "SKU-D01-Y", "SKU-D02-Y", "SKU-D03-Y", "SKU-D04-Y", "SKU-D05-Y",
    "END-001", "END-002", "END-003", "END-004", "END-005", "END-010", "END-001",
    "IRON01", "IRON02", "IRON03", "IRON04", "IRON05", "IRON06", "IRON07", "IRON08", "IRON09", "IRON10",
    "IRON11", "IRON12", "IRON13", "IRON14", "IRON15", "IRON16", "IRON17", "IRON18", "IRON19", "IRON20",
    "IRON21", "IRON22", "IRON23", "IRON24", "IRON25", "IRON26", "IRON27", "IRON28", "IRON29", "IRON30",
    "IRON31", "IRON32", "IRON33", "IRON34", "IRON35", "IRON36", "IRON37", "IRON38", "IRON39", "IRON40",
    "IRON41", "IRON42", "IRON43", "IRON44", "IRON45", "IRON46", "IRON47", "IRON48", "IRON49", "IRON50",
    "IRON51", "IRON52", "IRON53", "IRON54", "IRON55", "IRON56", "IRON57", "IRON58", "IRON59", "IRON60",
    "IRON61", "IRON62", "IRON63", "IRON64", "IRON65", "IRON66", "IRON67", "IRON68", "IRON69", "IRON70",
    "IRON71", "IRON72", "IRON73", "IRON74", "IRON75", "IRON76", "IRON77", "IRON78", "IRON79", "IRON80",
    "IRON81", "IRON82", "IRON83", "IRON84", "IRON85", "IRON86", "IRON87", "IRON88", "IRON89", "IRON90",
    "IRON91", "IRON92", "IRON93", "IRON94", "IRON95", "IRON96", "IRON97", "IRON98", "IRON99", "IRON100"
} ' total char with separator 257 (230 char + 26 separator [,] )

'Write the contents of your array to column A of the data sheet.
For i As Integer = 0 To arrayString2.Length - 1
    ' Note: IronXL row and cell indices are 1-based.
    sheet($"A{i + 1}").Value = arrayString2(i)
Next

' Create the formula string that points to our data range.
' This will look like: 'ValidationData'!$A$1:$A$100

Dim formula As String = $"'{sheet.Name}'!$A$1:$A${arrayString2.Length}"
Console.WriteLine($"Generated formula for validation: {formula}")

Dim sku2Validation = sheet.DataValidations.AddFormulaListRule(sheet($"B{validationRangeStart}:B{validationRangeFinish}"), formula)

sku2Validation.ShowErrorBox = True
sku2Validation.ErrorBoxTitle = "Invalid SKU2"
sku2Validation.ErrorBoxText = "Please select a SKU from the list."
sku2Validation.ErrorAlert = ErrorAlert.Stop

' --- Final Touches ---
sheet.AutoSizeColumn(0, True)
sheet.AutoSizeColumn(1, True)

Dim fileName = "validationRuleExample.xlsx"
workBook.SaveAs(fileName)

Console.WriteLine($"Successfully created '{fileName}' with 2 validation rules example.")
$vbLabelText   $csharpLabel

輸出 Excel 檔案

Output Validation Example related to 輸出 Excel 檔案

如您所見，使用 AddFormulaListRule 後，Excel 檔案運作穩定，不會導致任何當機。 若要親自試用，請參閱此連結，查看本文中使用的應用程式示範及 Excel 檔案。此示範將讓您親眼見證實際運作流程，並了解如何將其應用於您的工作中。

Curtis Chau
Curtis Chau
  立即與工程團隊聯繫
技術撰稿人

Curtis Chau 擁有卡爾頓大學（Carleton University）的電腦科學學士學位，專精於前端開發，並精通 Node.js、TypeScript、JavaScript 及 React。他熱衷於打造直觀且美觀的用戶介面，喜歡運用現代框架，並創建結構完善、視覺上吸引人的手冊。

除了開發工作之外，Curtis 對物聯網（IoT）抱有濃厚興趣，致力於探索整合硬體與軟體的創新方法。閒暇時，他喜歡玩遊戲和開發 Discord 機器人，將對科技的熱愛與創意相結合。

準備開始了嗎？
Nuget 下載 2,052,917 | 版本： 2026.6 just released
Still Scrolling Icon

還在捲動嗎？

想要快速證明？ PM > Install-Package IronXL.Excel
執行範例 觀看您的資料變成試算表。