错误:<target> .ColumnName和<source> .ColumnName具有冲突的属性:DataType属性不匹配

Question

我正在尝试使用DataTable.Merge()选项合并多个Excel文件

    For Each fileName As String In Directory.GetFiles("C:\TEMP\.", "*.xls")
        Dim connectionString As String = String.Format("Provider=Microsoft.Jet.OLEDB.4.0; data source={0}; Extended Properties=""Excel 8.0;HDR=NO;IMEX=1;""", fileName)
        Dim adapter As New OleDbDataAdapter("SELECT * FROM [Sheet1$]", connectionString)
        Dim ds As New DataSet
        adapter.Fill(ds, "anyNameHere")
        Dim TempTable As DataTable
        TempTable = ds.Tables.Item("anyNameHere")
        table1.Merge(TempTable)
        MsgBox(fileName)
    Next
    DataGridView1.DataSource = table1
    MsgBox(table1.Rows.Count)

但在合并时会出现以下错误

<target>.ColumnName and <source>.ColumnName have conflicting properties: DataType property mismatch.

这是因为excel中的一列被读作文本而另一列被读为double,而两者都有数值.

为了避免这种情况,我还在连接字符串中提到了IMEX = 1,仍然出现此错误.

Answer 1

在合并中使用MissingSchemaAction.Ignore作为MissingSchemaAction参数

table1.Merge(TempTable, True, MissingSchemaAction.Ignore)