接口实现状态保存（三种方法）

最新推荐文章于 2024-11-19 23:59:14 发布

liu_111111

最新推荐文章于 2024-11-19 23:59:14 发布

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分类专栏：程序 C# 文章标签：接口状态保存

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本文展示了如何通过接口实现状态保存的三种方法：使用环境变量、内存存储和SQL Server数据库。通过定义`IMeetYouable`接口，实现了在不同场景下设置和获取信息的功能，包括设置和获取字符串信息、检查键是否存在以及获取所有键。代码示例详细说明了每种方法的实现细节。

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-----------------------IMeetYouable.cs------------------------------

namespace ClassLibrary1
{
public interface IMeetYouable
{
void SetInfo(string name,string value);
string GetInfo(string name);
string[] Name { get; }
bool IsExits(string name);
}
}

------------------------EnvironmentSettings.cs---------------------------------第一种方法

namespace ClassLibrary1
{
[Serializable]
public class EnvironmentSettings:IMeetYouable
{
public void SetInfo(string name, string value)
{
Environment.SetEnvironmentVariable(name, value, EnvironmentVariableTarget.User);
}

public string GetInfo(string name)
{
return Environment.GetEnvironmentVariable(name, EnvironmentVariableTarget.User);
}

public string[] Name
{
get {
IDictionary dic = Environment.GetEnvironmentVariables(EnvironmentVariableTarget.User);
List<string> list = new List<string>();
foreach (object item in dic.Keys)
{
list.Add(item.ToString());
}
return list.ToArray();
}
}

public bool IsExits(string name)
{
IDictionary dic = Environment.GetEnvironmentVariables(EnvironmentVariableTarget.User);
return dic.Contains(name);
}
}
}

-------------------------MemorySettings.cs------------------------------------第二种方法

namespace ClassLibrary1
{
[Serializable]
public class MemorySettings:IMeetYouable
{
Dictionary<string, string> dic = new Dictionary<string, string>();
public void SetInfo(string name, string value)
{
dic.Add(name, value);
}

public string GetInfo(string name)
{
return dic[name];
}

public string[] Name
{
get { return dic.Keys.ToArray(); }
}

public bool IsExits(string name)
{
return dic.ContainsKey(name);
}
}
}

-------------------------SqlServerSettings.cs--------------------------------第三种方法

namespace ClassLibrary1
{
[Serializable]
public class SqlServerSettings : IMeetYouable
{
public void SetInfo(string name, string value)
{
IDbConnection conn = new SqlConnection(@"Data Source=PC-20130106GGEO;Initial Catalog=lianxi;Persist Security Info=True;User ID=sa;Password=111111");
IDbCommand cmd = conn.CreateCommand();
cmd.CommandText = "insert into T_Meet(MeetKey,MeetValue) values(@meetkey,@meetvalue)";
cmd.Parameters.Add(new SqlParameter("@meetkey", name));
cmd.Parameters.Add(new SqlParameter("@meetvalue", value));
conn.Open();
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Dispose();
}

public string GetInfo(string name)
{
IDbConnection conn = new SqlConnection(@"Data Source=PC-20130106GGEO;Initial Catalog=lianxi;Persist Security Info=User ID=sa;Password=111111");
IDbCommand cmd = conn.CreateCommand();
cmd.CommandText = "select MeetValue from T_Meet where MeetKey=@meetkey";
cmd.Parameters.Add(new SqlParameter("@meetkey", name));
conn.Open();
object obj = cmd.ExecuteScalar();
cmd.Dispose();
conn.Dispose();
return obj.ToString();
}
List<string> list = new List<string>();

public string[] Name
{
get
{
DbConnection conn = new SqlConnection(@"Data Source=PC-20130106GGEO;Initial Catalog=lianxi;Persist Security Info=User ID=sa;Password=111111");
DbCommand cmd = conn.CreateCommand();
cmd.CommandText = "select * from T_Meet";
conn.Open();
DataTable dt = new DataTable();
DbDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
adapter.Fill(dt);
cmd.Dispose();
conn.Dispose();

foreach (DataRow row in dt.Rows)
{
list.Add(row["MeetKey"].ToString());
}
return list.ToArray();
}
}

public bool IsExits(string name)
{

return list.Contains(name);
}
}
}

------------------------------Web.config-----------------------

------------------------WebForm1.aspx----------------------------------------

</html>

---------------------WebForm1.aspx.cs-----------------------------

namespace 接口实现状态保存
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void btnSave_Click(object sender, EventArgs e)
{
ClassLibrary1.IMeetYouable meet = GetSettings();
meet.SetInfo("MeetTime", txtTime.Text);
meet.SetInfo("MeetAddress", txtAddress.Text);
meet.SetInfo("MeetWeather", txtWeather.Text);
meet.SetInfo("EatAddress", txtEat.Text);
ViewState["meet"] = meet;
}

private IMeetYouable GetSettings()
{
IMeetYouable meet = null;
string settings = ConfigurationManager.AppSettings["setting"];
if (settings.ToUpper() == "MEMORY")
{
meet = new MemorySettings();
}
else if (settings.ToUpper() == "ENVIROMENT")
{
meet = new EnvironmentSettings();
}
else if (settings.ToUpper() == "SQLSERVER")
{
meet = new SqlServerSettings();
}
return meet;
}

protected void btnSelect_Click(object sender, EventArgs e)
{
if (ViewState["meet"] != null)
{
IMeetYouable meet = ViewState["meet"] as IMeetYouable;
string meettime = meet.GetInfo(txtquery.Text);
Response.Write(meettime);
}
}

protected void btnSelectAll_Click(object sender, EventArgs e)
{
if (ViewState["meet"] != null)
{
IMeetYouable meet = ViewState["meet"] as IMeetYouable;
string[] infos = meet.Name;
foreach (string item in infos)
{
Response.Write(item);
}
}
}

protected void btnQuery_Click(object sender, EventArgs e)
{
if (ViewState["meet"] != null)
{
IMeetYouable meet = ViewState["meet"] as IMeetYouable;
Response.Write(meet.IsExits("MeetWeather1"));
}
}

}
}