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C#xls&xlsx查询从图纸中选择,而不考虑图纸名称

openfiledialog datatable winforms excel c#

0

Matt · 技术社区 · 7 年前

GetData 方法:

    private DataTable GetData(string userFileName)
    {
        string dirName = Path.GetDirectoryName(userFileName);
        string fileName = Path.GetFileName(userFileName);
        string fileExtension = Path.GetExtension(userFileName);
        string connection = string.Empty;
        string query = string.Empty;

        switch (fileExtension)
        {
            case ".xls":
                connection = $@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source={userFileName};" +
                               "Extended Properties=\"Excel 8.0; HDR=Yes; IMEX=1\"";
                query = "SELECT * FROM [Sheet1$]";
                break;

            case ".xlsx":
                connection = $@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={userFileName};" +
                               "Extended Properties=\"Excel 12.0; HDR=Yes; IMEX=1\"";
                query = "SELECT * FROM [Sheet1$]";
                break;

            case ".csv":
                connection = $@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={dirName};" +
                               "Extended Properties=\"text; HDR=Yes; IMEX=1; FMT=Delimited\"";
                query = $"SELECT * FROM [{fileName}]";
                break;
        }

        return FillData(connection, query);
    }

它适用于 .csv 文件,因为它使用文件名而不是图纸名。

它适用于 .xls .xlsx 包含名为 Sheet1

当我尝试使用 .xls/.xlsx

System.Data.OleDb.OLEDBEException:“Sheet1$”不是有效名称。确保它不包含无效字符或标点符号,并且不太长。”

另一个问题的答案是:

using (OleDbConnection conn = new OleDbConnection(connString))
{
    conn.Open();
    dtSchema = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
    Sheet1= dtSchema.Rows[0].Field<string>("TABLE_NAME");
}

没有帮助,因为我不知道这应该放在我的代码中,答案中也没有任何关于这应该放在哪里的指示。

我是这样加进去的吗?

string Sheet1 = dataGridView1.Rows[0].Field<string>("TABLE_NAME");

这给了我一个错误:

2 回复 | 直到 7 年前

1

3

Vladimir P. 7 年前

FillData 方法在您的 GetData 方法,通过 query

    private DataTable GetDataFromFirstSheet(string connection)
    {
        using (OleDbConnection conn = new OleDbConnection(connection))
        {
            using (DataTable dtSchema = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }))
            {
                string firstSheet = dtSchema.Rows[0].Field<string>("TABLE_NAME");

                //try to remove $ from sheetname if it will be not working
                using (OleDbCommand cmd = new OleDbCommand($"SELECT * FROM [{firstSheet}$]", conn))
                {
                    using (OleDbDataAdapter adp = new OleDbDataAdapter(cmd))
                    {
                        conn.Open();

                        DataTable dt = new DataTable();
                        adp.Fill(dt);

                        return dt;
                    }                            
                }
            }
        }
    }

2

3

soulflyman 7 年前

我很快为您的代码添加了一些修复程序,但这个解决方案还远远不够干净。你应该考虑Wordimar的解决方案,深入了解代码。以下是一些优秀的资源: https://github.com/EbookFoundation/free-programming-books

using (OleDbConnection conn = new OleDbConnection(connString))
{
    conn.Open();
    dtSchema = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
    Sheet1= dtSchema.Rows[0].Field<string>("TABLE_NAME");
}

之后,可以将收到的图纸名称插入查询中。

快速而肮脏,您的代码将如下所示,以使其与xlsx文件一起工作:

private static DataTable GetData(string userFileName)
    {
        string dirName = Path.GetDirectoryName(userFileName);
        string fileName = Path.GetFileName(userFileName);
        string fileExtension = Path.GetExtension(userFileName);
        string connection = string.Empty;
        string query = string.Empty;

        switch (fileExtension)
        {
            case ".xls":
                connection = $@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source={userFileName};" +
                             "Extended Properties=\"Excel 8.0; HDR=Yes; IMEX=1\"";
                query = "SELECT * FROM [Sheet1$]";
                break;

            case ".xlsx":
                connection = $@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={userFileName};" +
                             "Extended Properties=\"Excel 12.0; HDR=Yes; IMEX=1\"";
                string sheetName;
                using (OleDbConnection con = new OleDbConnection(connection))
                {
                    con.Open();
                    var dtSchema = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
                    sheetName = dtSchema.Rows[0].Field<string>("TABLE_NAME");
                }

                if (sheetName.Length <= 0) throw new InvalidDataException("No sheet found."); // abort if no sheet name was returned

                query = $"SELECT * FROM [{sheetName}]";
                break;

            case ".csv":
                connection = $@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={dirName};" +
                             "Extended Properties=\"text; HDR=Yes; IMEX=1; FMT=Delimited\"";
                query = $"SELECT * FROM [{fileName}]";
                break;
        }

        return FillData(connection, query);
    }