Question

我在ASP.Net中有一个Gridview - C＃。我有一个名为Assignment或Exam的列。在该列中，我有作业或考试的名称，例如："Exam 1"，"Assignment 5"我希望作为作业的每一行都应为红色且考试为蓝色。

在SQL Server或我的代码中执行此操作的最佳方法是什么？如果是这样，那么正确的代码是什么？

Answer 1

通过分别为每一行设置BackColor属性，可以在Gridview中设置行的背景颜色。要根据行中的数据执行此操作，您需要检查绑定的行，您可以在RowDataBound事件中执行此操作。以下是基本Gridview的快速标记，我们将其连接到服务器端事件：

<asp:GridView runat="server" AutoGenerateColumns="False" OnRowDataBound="TestGridView_RowDataBound" ID="TestGridView">
    <Columns>
        <asp:BoundField DataField="Type" HeaderText="Assignment/Exam" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
    </Columns>
</asp:GridView>

protected void Page_Load(object sender, EventArgs e)
{
    DataTable tests = new DataTable();
    tests.Columns.Add(new DataColumn("Type"));
    tests.Columns.Add(new DataColumn("Name"));
    tests.AcceptChanges();

    tests.Rows.Add(new []{"Assignment","StackOverflow Basics"});
    tests.Rows.Add(new[]{"Exam","Expert Markdown"});
    tests.Rows.Add(new[]{"Exam","Upvoting"});
    tests.Rows.Add(new[]{"Assignment","Rep Changes"});

    TestGridView.DataSource = tests;
    TestGridView.DataBind();
}

在事件的代码中，我们可以获取我们绑定的单个数据行并检查值，因此我们可以相应地设置BackColor：

protected void TestGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
    // Ignore the first row which is the header
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        // Get hold of the row and then the DataRow that it's being bound to
        GridViewRow row = e.Row;
        DataRow data = ((DataRowView)row.DataItem).Row;

        // Look at the value and set the colour accordingly
        switch (data.Field<string>("Type"))
        {
            case "Assignment":
                row.BackColor = System.Drawing.Color.FromName("Blue");
                break;
            case "Exam":
                row.BackColor = System.Drawing.Color.FromName("Red");
                break;
        }
    }
}

虽然您可能还想考虑将文字颜色设置为白色，但这样会更容易阅读。

但是，您可能希望将来有更多的灵活性，例如如果您添加第三个名为“Lab”的评估类型为绿色，则需要更改/重新编译/重新测试/重新部署代码。相反，如果您从数据库传递命名颜色，然后在RowDataBound事件中使用它，则可以避免某些工作，例如：

protected void TestGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
    // Ignore the first row which is the header
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        // Get hold of the row and then the DataRow that it's being bound to
        GridViewRow row = e.Row;
        DataRow data = ((DataRowView)row.DataItem).Row;

        row.BackColor = System.Drawing.Color.FromName(data.Field<string>("BackColour");
        row.ForeColor = System.Drawing.Color.FromName(data.Field<string>("TextColour");
    }
}

Answer 2

首先在变量中找到行索引。在下面的代码中，我使用了index作为变量。

grdWithLocation.Rows[index].BackColor = Color.FromArgb(255, 238, 238, 238);

Answer 3

我在库存数据库中使用它。它会检查日期，并将其与数据库中每个订单的日期进行比较。然后根据每行坐了多长时间，为每行上色。它在GridView的RowDataBound上

您应该能够修改代码以更改考试/作业的日期

energy = read.table(header = T, text = "country year        sector      UN              ETS
BG      2000        Energy      24076856.07     NA
BG      2001        Energy      27943916.88     NA
BG      2002        Energy      25263464.92     NA
BG      2003        Energy      27154117.22     NA
BG      2004        Energy      26936616.77     NA
BG      2005        Energy      27148080.12     NA
BG      2006        Energy      27444820.45     NA
BG      2007        Energy      30789683.97     31120644
BG      2008        Energy      32319694.49     30453798
BG      2009        Energy      29694118.01     27669012
BG      2010        Energy      31638282.52     29543392
BG      2011        Energy      36421966.96     34669936
BG      2012        Energy      31628708.27     30777290
BG      2013        Energy      27332059.98     27070570
BG      2014        Energy      29036437.07     28583008
BG      2015        Energy      30316871.19     29935784
BG      2016        Energy      27127914.93     26531704
BG      2017        Energy      NA              27966156
CH      2000        Energy      3171899.5       NA
CH      2001        Energy      3313509.6       NA
CH      2002        Energy      3390115.69      NA
CH      2003        Energy      3387122.65      NA
CH      2004        Energy      3682404.04      NA
CH      2005        Energy      3815915.41      NA
CH      2006        Energy      4031766.36      NA
CH      2007        Energy      3718892.16      NA
CH      2008        Energy      3837098.91      NA
CH      2009        Energy      3673731.74      NA
CH      2010        Energy      3846523.62      NA
CH      2011        Energy      3598219.48      NA
CH      2012        Energy      3640743.25      NA
CH      2013        Energy      3735935.29      NA
CH      2014        Energy      3607411.44      NA
CH      2015        Energy      3292576.93      NA
CH      2016        Energy      3380402.57      NA
CY      2000        Energy      2964656.86      NA
CY      2001        Energy      2847105.45      NA
CY      2002        Energy      3008827.44      NA
CY      2003        Energy      3235739.95      NA
CY      2004        Energy      3294769.3       NA
CY      2005        Energy      3483623.91      3471844
CY      2006        Energy      3665461.17      3653380
CY      2007        Energy      3814469.11      3801667
CY      2008        Energy      3980439.76      3967293
CY      2009        Energy      4005649.27      3992467
CY      2010        Energy      3880758.22      3868001
CY      2011        Energy      3722369.39      3728038
CY      2012        Energy      3557560.24      3545929
CY      2013        Energy      2839148.88      2829732
CY      2014        Energy      2950111.64      2940320
CY      2015        Energy      3032961.55      3023003
CY      2016        Energy      3310941.55      3300001
CY      2017        Energy      NA              3287834")

根据数据更改gridview中行的颜色

3 个答案: