Question

我正在尝试将pdf文件加载到字节数组，但在代码运行后，字节数组长度为零。不知道我做错了什么。该项目是vs 2010，以9x的速度运行win 7 32 bit os。希望有一个简单的解决方案来解决这个问题。提前谢谢。

Demonstrates the code I'm using to stream the pdf file to byte array

Answer 1

以下代码对我有用：

    private void btnOpenFile_Click(object sender, EventArgs e)
    {
        string strId = gridViewMain.SelectedRows[0].Cells["id"].Value.ToString();

        if (!string.IsNullOrEmpty(strId))
        {

            SqlCommand cmd = new SqlCommand(strQuery_GetAttachmentById, objConn);
            cmd.Parameters.AddWithValue("@attachId", strId);

            SqlDataAdapter da = new SqlDataAdapter(cmd);

            DataTable dt = new DataTable();

            da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
            SqlCommandBuilder sqlCmdBuilder = new SqlCommandBuilder(da);

            da.Fill(dt);

            DataRow dr = dt.Rows[0];

            byte[] PDFBytes = (byte[])dr["attachment"];
            LoadPdf(PDFBytes);
        }

    }

    public void LoadPdf(byte[] pdfBytes)
    {
        var PDFstream = new MemoryStream(pdfBytes);
        LoadPdf(PDFstream);
    }

    public void LoadPdf(Stream pdfstream)
    {
        // Create PDF Document
        var pdfDocument = PdfDocument.Load(pdfstream);

        // Load PDF Document into WinForms Control
        pdfRenderer1.Load(pdfDocument);    
    }
}

将PDF流式传输到字节数组

1 个答案: