Question

SQL表：

ID  CreatedDate     MessageText     CreatedBy   IsActive    ClientText      LocationText    ProviderText    SpecialtyText
1   March 4, 2015   dsdfsdf         Test1       False               
2   March 4, 2015   dsdfsdf         Test2       True                
3   March 4, 2015   dsdfsdf         Test2       True        Test Client     location1       Test2           MD
4   March 4, 2015   This is to add  Test1       False       Test Client     location2       Test3           DD

获取表格：

using (SqlConnection conn = new SqlConnection(gloString))
{
    string strSql = @"SELECT * FROM [DB].[dbo].[table2]";
    try
    {
        // create data adapter
        SqlDataAdapter da = new SqlDataAdapter(strSql, conn);
        // this will query your database and return the result to your datatable

        myDataSet = new DataSet();
        da.Fill(myDataSet);
    }
    catch (Exception ce)
    {
    }
}

我的ASP.net页面中有以下标签：<asp:Label ID="lblMessage" Font-Size="x-small" runat="server" Text="" ClientIDMode="Static"></asp:Label>

如何更新标签：

lblMessage.Text += "<b>ALL MESSAGES:</b> <br />";
foreach (ROW WHERE COLUMN {CLIENTTEXT}, {LOCATIONTEXT}, {PROVIDERTEXT}, AND {SPECIALTYTEXT} IS EMPTY)
{
    lblMessage.Text += {CREATEDDATE} + " - " + {MESSAGETEXT} + "<br /><br />";
}
lblMessage.Text += "<hr />";
lblMessage.Text += "<b>SPECIFIC MESSAGES:</b> <br />";

foreach (ROW WHERE COLUMN {CLIENTTEXT}, {LOCATIONTEXT}, {PROVIDERTEXT}, OR {SPECIALTYTEXT} IS NOT EMPTY)
{
    lblMessage.Text += {CREATEDDATE} + " - " + {MESSAGETEXT} + "<br /><br />";
}

Answer 1

我没有看到您展示的2 for循环的差异。

如果它只是一个表，那么你应该使用DataTable而不是DataSet

你可以这样做：

foreach (DataRow row in table.Rows)//table is a DataTable
{
    var clientText = row["ClientText"].ToString();
    var locationText = row["LocationText"].ToString();
    var providerText = row["ProviderText"].ToString();
    var specialtyText = row["SpecialtyText"].ToString();
    var createdDate = row["CreatedDate"].ToString();
    var messageText = row["MessageText"].ToString();

    if (string.IsNullOrEmpty(clientText) && 
        string.IsNullOrEmpty(locationText) && 
        string.IsNullOrEmpty(providerText) && 
        string.IsNullOrEmpty(specialtyText))
    {
        lblMessage.Text += createdDate + " - " + messageText + "<br /><br />";
    }
}

然后根据需要添加else块。您也可以使用linQ

foreach (var clientText in from DataRow row in table.Rows
                           let clientText = row["ClientText"].ToString()
                           let locationText = row["LocationText"].ToString()
                           let providerText = row["ProviderText"].ToString()
                           let specialtyText = row["SpecialtyText"].ToString()
                           where string.IsNullOrEmpty(clientText) && 
                                 string.IsNullOrEmpty(locationText) && 
                                 string.IsNullOrEmpty(providerText) && 
                                 string.IsNullOrEmpty(specialtyText)
                           select clientText)
{
    //some code here
}

Answer 2

我得到它的方式，你想使用不包含“SpecialityText”的行更新你的标签。问题是你不知道如何。

假设您在页面中使用的DataSet在获取之后仍然被命名为 myDataSet ，以下代码应该可以解决问题。请注意我假设您已导入一些数据访问命名空间。 DBNull.Value 应该替换为帮助程序使用的null表示形式。

string specific = "";
string generic = "";

foreach (DataRow r in myDataSet.tables[0].Rows){
    //Add all your conditions here. It seems you want two groups of messages
    if (r["SpecialtyText"].ToString == ""){
        generic += r["CreatedDate"] + " - " + r["MessageText"]  + "<br /><br />";
    }
    else{
        specific += r["CreatedDate"] + " - " + r["MessageText"] + "<br /><br />";
    }
}

lblMessage.Text = generic + "<hr /><b>SPECIFIC MESSAGES:</b> <br />" + specific;

根据条件将SQL行添加到ASP标签

2 个答案: