我正在创建 excel 文件XML编写器 https://msdn.microsoft.com/en-us/library/system.xml.xmlwriter(v=vs.110).aspx由于 xml 属性和文件类型电子表格，它的文件太大，大约 250mb。
我不能使用interop https://learn.microsoft.com/tr-tr/dotnet/csharp/programming-guide/interop/how-to-access-office-onterop-objects，因为用户不想在服务器上设置office
或第三部分 dll。
现在我想，我应该使用 Oledb 来创建 Excel 文件。
我的问题是我无法使用 oledb 在同一张表上写入多个表。
Error:
标准表达式中的数据类型不匹配
My Code:
connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR={1}'";
connectionString = string.Format(connectionString, outputFile, "YES");
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
conn.Open();
foreach (var item in dataSetList)
{
DataSet data = (DataSet)item.Value;
// creates the excel sheet
//DataSet data = item.Keys
//Iterate the tables in the dataset.
//Each table will become a tab or sheet in the workbook.
int maxcount = 0;
for (int kl = data.Tables.Count-1; kl >=0; kl--)
{
DataTable dt = data.Tables[kl];
string sheetSql1 = "";
if (dt.Columns.Count > maxcount)
maxcount = dt.Columns.Count;
var tableSchemaName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
if (tableSchemaName.Select("TABLE_NAME='" + data.DataSetName + "$'").Length == 0)
{
sheetSql1 = "CREATE TABLE [" + data.DataSetName + "] (";
if (dt.Columns.Count > 0)
{
//if (!dt.Columns[0].ColumnName.StartsWith("somespecificcaption"))
//{
for (int i = 0; i < dt.Columns.Count; i++)
{
string dataType;
//Set appropriate styling of each cell based on datatype
//This depends on how sql server ends up reporting the datatype.
switch (dt.Columns[i].DataType.ToString())
{
case "System.DateTime":
dataType = "DateTime";
break;
case "System.Decimal":
case "System.Double":
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.Byte":
dataType = "int";
break;
default:
dataType = "varchar(100)";
break;
}
sheetSql1 += "F" + i.ToString() + " " + dataType + ",";
//sheetSql1 += dt.Columns[i].ColumnName + " varchar(50),";
}
sheetSql1 = sheetSql1.Remove(sheetSql1.Length - 1);
sheetSql1 += ")";
using (OleDbCommand cmd = new OleDbCommand(sheetSql1, conn))
{
cmd.ExecuteNonQuery();
}
//}
}
}
// Write out row data
foreach (DataRow dr in dt.Rows)
{
string fields = "";
string values = "";
// now add records into the excel sheet just created
sheetSql1 = "INSERT INTO [" + data.DataSetName + "]";
for (int j = 0; j < maxcount; j++)
{
//fields += dt.Columns[j].ColumnName + ",";
//values += "@" + dt.Columns[j].ColumnName + ",";
fields += "F" + j.ToString() + ",";
values += "@F" + j.ToString() + ",";
}
fields = fields.Remove(fields.Length - 1);
values = values.Remove(values.Length - 1);
sheetSql1 += "(" + fields + ") VALUES(" + values + ")";
using (OleDbCommand cmd = new OleDbCommand(sheetSql1, conn))
{
for (int k = 0; k < maxcount; k++)
{
string output;
//Set appropriate styling of each cell based on datatype
//This depends on how sql server ends up reporting the datatype.
if (k < dt.Columns.Count)
{
switch (dt.Columns[k].DataType.ToString()) // FormatException murat data types
{
case "System.DateTime":
try
{
output = DateTime.Parse(dr[k].ToString()).ToString("dd/MM/yyyy");
}
catch (FormatException fe) //date is null or empty in dataset
{
output = "";
}
break;
case "System.Decimal":
case "System.Double":
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.Byte":
output = dr[k].ToString().Trim();
break;
default:
output = dr[k].ToString().Trim();
break;
}
}
else
output = "0";
// cmd.Parameters.AddWithValue("@" + dt.Columns[k].ColumnName, dr[k]);
cmd.Parameters.AddWithValue("@F" + k.ToString(), output);
}
cmd.ExecuteNonQuery();
}
}
}
}
conn.Close();
}
我想写这样的表格 https://i.stack.imgur.com/fAQyt.png
None
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