有關字串資料驗證的Excel限制
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Microsoft Excel在字串列表的長度上有已知限制，規定列表的總長度（包括像逗號這樣的分隔符）不能超過255個字元。
此問題發生在您手動輸入字串列表到來源欄位時，而不是從現有的 Excel表單範圍中選擇資料，如下所示。
Excel限制問題
Excel限制的解決方案
解決這個限制的標準方法是在工作表的列或行中建立一個值列表，而不是在來源欄位中輸入字串列表。 如下所示。
Excel限制解決方案範例
之後，使用公式參考，例如C1:C100，在資料驗證中指向該範圍。
此方法繞過了限制，讓您能夠建立一個不受255字元限制的下拉列表。
IronXL的問題
IronXL使用AddStringListRule方法來應用一個字串列表進行資料驗證。 然而，由於前面提到的Excel字元限制，儲存方法仍然有效。 但是，需要注意的是，如果列表超過255個字元，可能會導致一個嚴重問題：在開啟文件時Excel崩潰。 這裡有一個說明問題的範例。
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 = { "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" }
' 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，我們試圖將一個名為CategoryProductCatalog.xlsx。 然而，由於這些限制，當用Microsoft Excel開啟文件時，它顯示了一條訊息，指出文件已損壞，無法開啟。
IronXL的解決方案
為了正確解決此Excel限制，IronXL提供了DataValidations屬性獲得。 此方法類似於處理Excel的解決方案。
我們首先將值列表寫入工作表的一個範圍的單元格中。 然後使用AddFormulaListRule將該範圍作為下拉列表的來源參考。這有效地繞過了限制，就像我們對Excel解決方案所做的一樣，但在此情況下，它是程式化的。
使用AddFormulaListRule正確地繞過了Excel的限制，並確保即使有長長的值列表，文件在Excel中開啟時仍然可讀且穩定。
程式碼範例
下面是繞過此問題的附加程式碼範例。 使用同一個工作簿，我們首先建立一個工作表，然後定義所有的列標題。 我們從前一個範例中輸入了字串列表，以及新資料以說明功能性。 然後我們調用AddFormulaListRule與上述的驗證範圍。 最後，我們將其儲存為validationRuleExample.xlsx。 為了確保我們的工作簿未損壞且可以正常使用，我們在Excel中打開它。 這一步至關重要，因為它展示了我們程式碼的成功實施。
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 = {"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"}
'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($"A{i + 1}").Value = arrayString2(i)
Next i
' Create the formula string that points to our data range.
' This will look like: 'ValidationData'!$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文件
正如您所見，Excel文件穩定，使用AddFormulaListRule後不會導致任何崩潰。 欲親自嘗試，請參閱此連結以獲得本文中使用的應用程式演示及Excel文件。這個演示將允許您看到過程的實際操作並了解如何在工作中應用它。
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