diff --git a/README.md b/README.md
index 91918cc6e..a77d6cfb9 100644
--- a/README.md
+++ b/README.md
@@ -3,13 +3,12 @@
 <div align="center">
 <h2>A set of enterprise-class UI components based on Bootstrap and Blazor.</h2>
 
-
-[![Github build](https://img.shields.io/github/workflow/status/ArgoZhang/BootstrapBlazor/Build%20Project/main?label=main&logo=github&logoColor=green)](https://github.com/ArgoZhang/BootstrapBlazor/actions?query=workflow%3A%22Build+Project%22+branch%3Amain)
+[![License](https://img.shields.io/github/license/argozhang/bootstrapblazor.svg?logo=git&logoColor=red)](https://github.com/ArgoZhang/BootstrapBlazor/blob/main/LICENSE)
 [![Nuget](https://img.shields.io/nuget/v/BootstrapBlazor.svg?color=red&logo=nuget&logoColor=green)](https://www.nuget.org/packages/BootstrapBlazor/)
 [![Nuget](https://img.shields.io/nuget/dt/BootstrapBlazor.svg?logo=nuget&logoColor=green)](https://www.nuget.org/packages/BootstrapBlazor/)
-[![Github](https://img.shields.io/github/license/argozhang/bootstrapblazor.svg?logo=git&logoColor=red)](https://github.com/ArgoZhang/BootstrapBlazor/blob/main/LICENSE)
 [![Repo Size](https://img.shields.io/github/repo-size/ArgoZhang/BootstrapBlazor.svg?logo=github&logoColor=green&label=repo)](https://github.com/ArgoZhang/BootstrapBlazor)
 [![Commit Date](https://img.shields.io/github/last-commit/ArgoZhang/BootstrapBlazor/main.svg?logo=github&logoColor=green&label=commit)](https://github.com/ArgoZhang/BootstrapBlazor)
+[![Github build](https://img.shields.io/github/workflow/status/ArgoZhang/BootstrapBlazor/Build%20Project/main?label=main&logo=github&logoColor=green)](https://github.com/ArgoZhang/BootstrapBlazor/actions?query=workflow%3A%22Build+Project%22+branch%3Amain)
 [![codecov](https://codecov.io/gh/dotnetcore/BootstrapBlazor/branch/main/graph/badge.svg?token=5SXIWHXZC3)](https://codecov.io/gh/dotnetcore/BootstrapBlazor)
 </div>
 
diff --git a/README.zh-CN.md b/README.zh-CN.md
index f3e5729b9..f6bf580e0 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -3,12 +3,12 @@
 <div align="center">
 <h2>一套基于 Bootstrap 和 Blazor 的企业级组件库</h2>
 
-[![Github build](https://img.shields.io/github/workflow/status/ArgoZhang/BootstrapBlazor/Build%20Project/main?label=main&logo=github&logoColor=green)](https://github.com/ArgoZhang/BootstrapBlazor/actions?query=workflow%3A%22Build+Project%22+branch%3Amain)
+[![License](https://img.shields.io/github/license/argozhang/bootstrapblazor.svg?logo=git&logoColor=red)](https://github.com/ArgoZhang/BootstrapBlazor/blob/main/LICENSE)
 [![Nuget](https://img.shields.io/nuget/v/BootstrapBlazor.svg?color=red&logo=nuget&logoColor=green)](https://www.nuget.org/packages/BootstrapBlazor/)
 [![Nuget](https://img.shields.io/nuget/dt/BootstrapBlazor.svg?logo=nuget&logoColor=green)](https://www.nuget.org/packages/BootstrapBlazor/)
-[![Github](https://img.shields.io/github/license/argozhang/bootstrapblazor.svg?logo=git&logoColor=red)](https://github.com/ArgoZhang/BootstrapBlazor/blob/main/LICENSE)
 [![Repo Size](https://img.shields.io/github/repo-size/ArgoZhang/BootstrapBlazor.svg?logo=github&logoColor=green&label=repo)](https://github.com/ArgoZhang/BootstrapBlazor)
 [![Commit Date](https://img.shields.io/github/last-commit/ArgoZhang/BootstrapBlazor/main.svg?logo=github&logoColor=green&label=commit)](https://github.com/ArgoZhang/BootstrapBlazor)
+[![Github build](https://img.shields.io/github/workflow/status/ArgoZhang/BootstrapBlazor/Build%20Project/main?label=main&logo=github&logoColor=green)](https://github.com/ArgoZhang/BootstrapBlazor/actions?query=workflow%3A%22Build+Project%22+branch%3Amain)
 [![codecov](https://codecov.io/gh/dotnetcore/BootstrapBlazor/branch/main/graph/badge.svg?token=5SXIWHXZC3)](https://codecov.io/gh/dotnetcore/BootstrapBlazor)
 </div>
 
diff --git a/src/BootstrapBlazor/Components/Print/Print.cs b/src/BootstrapBlazor/Components/Print/Print.cs
index 33236f244..e56ab314e 100644
--- a/src/BootstrapBlazor/Components/Print/Print.cs
+++ b/src/BootstrapBlazor/Components/Print/Print.cs
@@ -42,11 +42,7 @@ namespace BootstrapBlazor.Components
             PrintService.Register(this, PrintDialogAsync);
         }
 
-        private Task PrintDialogAsync(DialogOption option)
-        {
-            DialogService.Show(option);
-            return Task.CompletedTask;
-        }
+        private Task PrintDialogAsync(DialogOption option) => DialogService.Show(option);
 
         /// <summary>
         /// Dispose 方法
diff --git a/src/BootstrapBlazor/Components/Print/PrintButton.razor.cs b/src/BootstrapBlazor/Components/Print/PrintButton.razor.cs
index 3e4addf6e..5bd8dcdd9 100644
--- a/src/BootstrapBlazor/Components/Print/PrintButton.razor.cs
+++ b/src/BootstrapBlazor/Components/Print/PrintButton.razor.cs
@@ -42,15 +42,14 @@ namespace BootstrapBlazor.Components
         protected override void OnParametersSet()
         {
             // 不需要走 base.OnParametersSet 方法
+            AdditionalAttributes ??= new Dictionary<string, object>();
             if (string.IsNullOrEmpty(PreviewUrl))
             {
-                AdditionalAttributes ??= new Dictionary<string, object>();
                 AdditionalAttributes.Add("onclick", "$.bb_printview(this)");
                 Target = null;
             }
             else
             {
-                AdditionalAttributes ??= new Dictionary<string, object>();
                 AdditionalAttributes.Remove("onclick", out _);
                 Target = "_blank";
             }
diff --git a/test/UnitTest/Components/PrintTest.cs b/test/UnitTest/Components/PrintTest.cs
new file mode 100644
index 000000000..b33f744ad
--- /dev/null
+++ b/test/UnitTest/Components/PrintTest.cs
@@ -0,0 +1,77 @@
+// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+// Website: https://www.blazor.zone or https://argozhang.github.io/
+
+using BootstrapBlazor.Components;
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Threading.Tasks;
+using System.Web;
+using UnitTest.Core;
+using Xunit;
+
+namespace UnitTest.Components
+{
+    public class PrintTest : BootstrapBlazorTestBase
+    {
+        [Fact]
+        public void PrintButton_Ok()
+        {
+            var cut = Context.RenderComponent<BootstrapBlazorRoot>(pb =>
+            {
+                pb.AddChildContent<PrintButton>();
+            });
+            Assert.Contains("<a onclick=\"$.bb_printview(this)\" class=\"btn btn-primary\" role=\"button\"><i class=\"fa fa-print\"></i><span>打印</span></a>", HttpUtility.HtmlDecode(cut.Markup));
+
+            var button = cut.FindComponent<PrintButton>();
+            button.SetParametersAndRender(pb =>
+            {
+                pb.Add(b => b.PreviewUrl, "/PrintTest");
+            });
+            Assert.Contains("href=\"/PrintTest\"", button.Markup);
+        }
+
+        [Fact]
+        public void PrintService_Error()
+        {
+            var cut = Context.RenderComponent<BootstrapBlazorRoot>();
+            var printService = cut.Services.CreateScope().ServiceProvider.GetRequiredService<PrintService>();
+            Assert.ThrowsAsync<InvalidOperationException>(() => printService.PrintAsync<Button>(op =>
+            {
+                // 弹窗配置
+                op.Title = "数据查询窗口";
+                // 弹窗组件所需参数
+                return new Dictionary<string, object>();
+            }));
+        }
+
+        [Fact]
+        public void PrintService_Ok()
+        {
+            var cut = Context.RenderComponent<BootstrapBlazorRoot>(pb =>
+            {
+                pb.AddChildContent<MockPrintButton>();
+            });
+            var button = cut.FindComponent<MockPrintButton>();
+            cut.InvokeAsync(() => button.Instance.PrintAsync());
+            Assert.Contains("打印按钮测试", HttpUtility.HtmlDecode(cut.Markup));
+        }
+
+        private class MockPrintButton : ComponentBase
+        {
+            [Inject]
+            [NotNull]
+            private PrintService? PrintService { get; set; }
+
+            public Task PrintAsync() => PrintService.PrintAsync<Button>(op =>
+            {
+                op.Title = "打印按钮测试";
+                return new Dictionary<string, object>();
+            });
+        }
+    }
+}