DataControlField.HeaderText Propriedade
Definição
Importante
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Obtém ou define o texto exibido no item de cabeçalho de um campo de controle de dados.
public:
virtual property System::String ^ HeaderText { System::String ^ get(); void set(System::String ^ value); };public virtual string HeaderText { get; set; }member this.HeaderText : string with get, setPublic Overridable Property HeaderText As StringValor da propriedade
Uma cadeia de caracteres que é exibida no item de cabeçalho de DataControlField.
Exemplos
O exemplo de código a seguir demonstra como definir declarativamente as HeaderText propriedades das BoundField colunas para exibir texto nos cabeçalhos de coluna de um GridView controle. Este exemplo de código demonstra um cenário de detalhes mestres no qual um GridView controle é usado para exibir um subconjunto de dados enquanto o DetailsView controle é usado para exibir um conjunto maior de dados e inserir novos registros. O exemplo usa dois SqlDataSource controles: um para popular o GridView controle e outro para popular o DetailsView controle e inserir dados.
<%@Page Language="C#" %>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.Common" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void On_Inserting(Object sender, SqlDataSourceCommandEventArgs e) {
SqlParameter insertedKey = new SqlParameter("@PK_New", SqlDbType.Int);
insertedKey.Direction = ParameterDirection.Output;
e.Command.Parameters.Add(insertedKey);
}
private void On_Inserted(Object sender, SqlDataSourceStatusEventArgs e) {
DbCommand command = e.Command;
// The label displays the primary key of the recently inserted row.
Label1.Text = command.Parameters["@PK_New"].Value.ToString();
// Force a refresh after the data is inserted.
GridView1.DataBind();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView
id="GridView1"
runat="server"
AutoGenerateColumns="False"
DataKeyNames="EmployeeID"
DataSourceID="SqlDataSource1">
<columns>
<asp:BoundField HeaderText="First Name" DataField="FirstName" />
<asp:BoundField HeaderText="Last Name" DataField="LastName" />
<asp:BoundField HeaderText="Title" DataField="Title" />
<asp:ButtonField ButtonType="Link" CommandName="Select" Text="Details..." />
</columns>
</asp:GridView>
<asp:SqlDataSource
id="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:MyNorthwind %>"
SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees">
</asp:SqlDataSource>
<hr />
<asp:DetailsView
id="DetailsView1"
runat="server"
DataSourceID="SqlDataSource2"
AutoGenerateRows="False"
AutoGenerateInsertButton="True">
<fields>
<asp:BoundField HeaderText="First Name" DataField="FirstName" ReadOnly="False"/>
<asp:BoundField HeaderText="Last Name" DataField="LastName" ReadOnly="False"/>
<asp:TemplateField HeaderText="Title">
<ItemTemplate>
<asp:DropDownList
id="TitleDropDownList"
runat="server"
selectedvalue="<%# Bind('Title') %>" >
<asp:ListItem Selected="True">Sales Representative</asp:ListItem>
<asp:ListItem>Sales Manager</asp:ListItem>
<asp:ListItem>Vice President, Sales</asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Notes" DataField="Notes" ReadOnly="False"/>
</fields>
</asp:DetailsView>
<asp:SqlDataSource
id="SqlDataSource2"
runat="server"
ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
SelectCommand="SELECT * FROM Employees"
InsertCommandType = "StoredProcedure"
InsertCommand="sp_insertemployee"
OnInserting="On_Inserting"
OnInserted ="On_Inserted"
FilterExpression="EmployeeID={0}">
<FilterParameters>
<asp:ControlParameter Name="EmployeeID" ControlId="GridView1" PropertyName="SelectedValue" />
</FilterParameters>
</asp:SqlDataSource>
<!--
-- An example sp_insertemployee stored procedure that returns
-- the primary key of the row that was inserted in an OUT parameter.
CREATE PROCEDURE sp_insertemployee
@FirstName nvarchar(10),
@LastName nvarchar(20) ,
@Title nvarchar(30),
@Notes nvarchar(200),
@PK_New int OUTPUT
AS
INSERT INTO Employees(FirstName,LastName,Title,Notes)VALUES (@FirstName,@LastName,@Title,@Notes)
SELECT @PK_New = @@IDENTITY
RETURN (1)
GO
-->
<asp:Label
id="Label1"
runat="server" />
</form>
</body>
</html>
<%@Page Language="VB" %>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.Common" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub On_Inserting(ByVal sender As Object, ByVal e As SqlDataSourceCommandEventArgs)
Dim insertedKey As SqlParameter
insertedKey = New SqlParameter("@PK_New", SqlDbType.Int)
insertedKey.Direction = ParameterDirection.Output
e.Command.Parameters.Add(insertedKey)
End Sub 'On_Inserting
Sub On_Inserted(ByVal sender As Object, ByVal e As SqlDataSourceStatusEventArgs)
Dim command As DbCommand
command = e.Command
' The label displays the primary key of the recently inserted row.
Label1.Text = command.Parameters("@PK_New").Value.ToString()
' Explicitly call DataBind to refresh the data
' and show the newly inserted row.
GridView1.DataBind()
End Sub 'On_Inserted
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView
id="GridView1"
runat="server"
AutoGenerateColumns="False"
DataKeyNames="EmployeeID"
DataSourceID="SqlDataSource1">
<columns>
<asp:BoundField HeaderText="First Name" DataField="FirstName" />
<asp:BoundField HeaderText="Last Name" DataField="LastName" />
<asp:BoundField HeaderText="Title" DataField="Title" />
<asp:ButtonField ButtonType="Link" CommandName="Select" Text="Details..." />
</columns>
</asp:GridView>
<asp:SqlDataSource
id="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:MyNorthwind %>"
SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees">
</asp:SqlDataSource>
<hr />
<asp:DetailsView
id="DetailsView1"
runat="server"
DataSourceID="SqlDataSource2"
AutoGenerateRows="False"
AutoGenerateInsertButton="True">
<fields>
<asp:BoundField HeaderText="First Name" DataField="FirstName" ReadOnly="False"/>
<asp:BoundField HeaderText="Last Name" DataField="LastName" ReadOnly="False"/>
<asp:TemplateField HeaderText="Title">
<ItemTemplate>
<asp:DropDownList
id="TitleDropDownList"
runat="server"
selectedvalue="<%# Bind('Title') %>" >
<asp:ListItem Selected="True">Sales Representative</asp:ListItem>
<asp:ListItem>Sales Manager</asp:ListItem>
<asp:ListItem>Vice President, Sales</asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Notes" DataField="Notes" ReadOnly="False"/>
</fields>
</asp:DetailsView>
<asp:SqlDataSource
id="SqlDataSource2"
runat="server"
ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
SelectCommand="SELECT * FROM Employees"
InsertCommandType = "StoredProcedure"
InsertCommand="sp_insertemployee"
OnInserting="On_Inserting"
OnInserted ="On_Inserted"
FilterExpression="EmployeeID={0}">
<FilterParameters>
<asp:ControlParameter Name="EmployeeID" ControlId="GridView1" PropertyName="SelectedValue" />
</FilterParameters>
</asp:SqlDataSource>
<!--
-- An example sp_insertemployee stored procedure that returns
-- the primary key of the row that was inserted in an OUT parameter.
CREATE PROCEDURE sp_insertemployee
@FirstName nvarchar(10),
@LastName nvarchar(20) ,
@Title nvarchar(30),
@Notes nvarchar(200),
@PK_New int OUTPUT
AS
INSERT INTO Employees(FirstName,LastName,Title,Notes)VALUES (@FirstName,@LastName,@Title,@Notes)
SELECT @PK_New = @@IDENTITY
RETURN (1)
GO
-->
<asp:Label
id="Label1"
runat="server" />
</form>
</body>
</html>
Comentários
Use a HeaderText propriedade para identificar um campo em um controle de dados com um nome amigável. A aplicação mais comum da HeaderText propriedade é fornecer nomes de coluna significativos para campos associados a dados em um GridView ou DetailsView controle.
Observação
Se as propriedades e HeaderImageUrl as HeaderText propriedades estiverem definidas, a HeaderImageUrl propriedade terá precedência.
O valor dessa propriedade, quando definido, pode ser salvo automaticamente em um arquivo de recurso usando uma ferramenta de designer. Para obter mais informações, consulte LocalizableAttribute e Globalização e Localização.